Go-wide payoffs
Once the board is full, these turn quantity into a win: mass pumps, damage per creature, and anthems that make a pile of tokens lethal.
Edit it and search again — it reads plain English, so payoffs for having lots of creatures under 3 mana works too.

Three Tree City Legendary LandAs Three Tree City enters, choose a creature type. {T}: Add {C}. {2}, {T}: Choose a color. Add an amount of mana of that color equ$31.09

Doubling Season EnchantmentIf an effect would create one or more tokens under your control, it creates twice that many of those tokens instead. If an effect $36.45

Impact Tremors EnchantmentWhenever a creature you control enters, this enchantment deals 1 damage to each opponent.

Avenger of Zendikar Creature — ElementalWhen this creature enters, create a 0/1 green Plant creature token for each land you control. Landfall — Whenever a land you contr$0.45

Craterhoof Behemoth Creature — BeastHaste When this creature enters, creatures you control gain trample and get +X/+X until end of turn, where X is the number of crea$24.41

Anointed Procession EnchantmentIf an effect would create one or more tokens under your control, it creates twice that many of those tokens instead.$61.52

Shamanic Revelation SorceryDraw a card for each creature you control. Ferocious — You gain 4 life for each creature you control with power 4 or greater.$1.49

Vanquisher's Banner ArtifactAs this artifact enters, choose a creature type. Creatures you control of the chosen type get +1/+1. Whenever you cast a creature $4.69

Parallel Lives EnchantmentIf an effect would create one or more tokens under your control, it creates twice that many of those tokens instead.$39.74

Unnatural Growth EnchantmentAt the beginning of each combat, double the power and toughness of each creature you control until end of turn.$3.93

Gaea's Cradle Legendary Land{T}: Add {G} for each creature you control.$1643.14

Ghalta, Primal Hunger Legendary Creature — Elder DinosaurThis spell costs {X} less to cast, where X is the total power of creatures you control. Trample (This creature can deal excess com$1.06

Adeline, Resplendent Cathar Legendary Creature — Human KnightVigilance Adeline's power is equal to the number of creatures you control. Whenever you attack, for each opponent, create a 1/1 wh$2.81

Terror of the Peaks Creature — DragonFlying Spells your opponents cast that target this creature cost an additional 3 life to cast. Whenever another creature you contr$30.00

Cathars' Crusade EnchantmentWhenever a creature you control enters, put a +1/+1 counter on each creature you control.$10.64

Unbreakable Formation InstantCreatures you control gain indestructible until end of turn. Addendum — If you cast this spell during your main phase, put a +1/+1$1.33

Second Harvest InstantFor each token you control, create a token that's a copy of that permanent.$5.51

Beastmaster Ascension EnchantmentWhenever a creature you control attacks, you may put a quest counter on this enchantment. As long as this enchantment has seven or$6.26

Growing Rites of Itlimoc // Itlimoc, Cradle of the Sun Legendary Enchantment // Legendary LandGrowing Rites of Itlimoc: When Growing Rites of Itlimoc enters, look at the top four cards of your library. You may reveal a creat$10.61

Banner of Kinship ArtifactAs this artifact enters, choose a creature type. This artifact enters with a fellowship counter on it for each creature you contro$7.20

Caretaker's Talent Enchantment — Class(Gain the next level as a sorcery to add its ability.) Whenever one or more tokens you control enter, draw a card. This ability tr$11.46

Mentor of the Meek Creature — Human SoldierWhenever another creature you control with power 2 or less enters, you may pay {1}. If you do, draw a card.$4.76

Intangible Virtue EnchantmentCreature tokens you control get +1/+1 and have vigilance.$0.33

Shared Animosity EnchantmentWhenever a creature you control attacks, it gets +1/+0 until end of turn for each other attacking creature that shares a creature $4.98

Purphoros, God of the Forge Legendary Enchantment Creature — GodIndestructible As long as your devotion to red is less than five, Purphoros isn't a creature. Whenever another creature you contro$30.75

Mirari's Wake EnchantmentCreatures you control get +1/+1. Whenever you tap a land for mana, add one mana of any type that land produced.$7.44

Elspeth, Storm Slayer Legendary Planeswalker — ElspethIf one or more tokens would be created under your control, twice that many of those tokens are created instead. +1: Create a 1/1 w$42.74

Warstorm Surge EnchantmentWhenever a creature you control enters, it deals damage equal to its power to any target.$1.44

Priest of Titania Creature — Elf Druid{T}: Add {G} for each Elf on the battlefield.$1.42

Flowering of the White Tree Legendary EnchantmentLegendary creatures you control get +2/+1 and have ward {1}. Nonlegendary creatures you control get +1/+1.$10.96
Prices and legality come from Scryfall. Every card here was scored by the same search that runs when you type a question.
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