The halves of a loop: untappers, free sacrifice outlets, cost reducers and copy effects that go infinite with the right partner.
71%Skullclamp Artifact — EquipmentEquipped creature gets +1/-1. Whenever equipped creature dies, draw two cards. Equip {1}$4.95
74%Ashnod's Altar ArtifactSacrifice a creature: Add {C}{C}.$17.09
74%Panharmonicon ArtifactIf an artifact or creature entering causes a triggered ability of a permanent you control to trigger, that ability triggers an add$6.13
70%Seedborn Muse Creature — SpiritUntap all permanents you control during each other player's untap step.$19.51
71%Phyrexian Altar ArtifactSacrifice a creature: Add one mana of any color.$58.73
74%Laboratory Maniac Creature — Human WizardIf you would draw a card while your library has no cards in it, you win the game instead.$2.41
81%Strionic Resonator Artifact{2}, {T}: Copy target triggered ability you control. You may choose new targets for the copy. (A triggered ability uses the words $7.93
70%Emry, Lurker of the Loch Legendary Creature — Merfolk WizardAffinity for artifacts (This spell costs {1} less to cast for each artifact you control.) When Emry enters, mill four cards. {T}: $0.57
77%Isochron Scepter ArtifactImprint — When this artifact enters, you may exile an instant card with mana value 2 or less from your hand. {2}, {T}: You may cop$13.15
72%High Tide InstantUntil end of turn, whenever a player taps an Island for mana, that player adds an additional {U}.$1.62
77%Aurelia, the Warleader Legendary Creature — AngelFlying, vigilance, haste Whenever Aurelia attacks for the first time each turn, untap all creatures you control. After this phase,$5.97
72%Thousand-Year Elixir ArtifactYou may activate abilities of creatures you control as though those creatures had haste. {1}, {T}: Untap target creature.$15.27
76%The Soul Stone Legendary Artifact — Infinity StoneIndestructible {T}: Add {B}. {6}{B}, {T}, Exile a creature you control: Harness The Soul Stone. (Once harnessed, its ∞ ability is $93.34
76%Devoted Druid Creature — Elf Druid{T}: Add {G}. Put a -1/-1 counter on this creature: Untap this creature.$1.33
84%Kiki-Jiki, Mirror Breaker Legendary Creature — Goblin ShamanHaste {T}: Create a token that's a copy of target nonlegendary creature you control, except it has haste. Sacrifice it at the begi$16.99
70%Amulet of Vigor ArtifactWhenever a permanent you control enters tapped, untap it.$51.57
79%Krark-Clan Ironworks ArtifactSacrifice an artifact: Add {C}{C}.$16.71
71%Skirk Prospector Creature — GoblinSacrifice a Goblin: Add {R}.$0.29
84%Rings of Brighthearth ArtifactWhenever you activate an ability, if it isn't a mana ability, you may pay {2}. If you do, copy that ability. You may choose new ta$6.29
78%Deadeye Navigator Creature — SpiritSoulbond (You may pair this creature with another unpaired creature when either enters. They remain paired for as long as you cont$3.52
76%Echoes of Eternity Kindred Enchantment — EldraziIf a triggered ability of a colorless spell you control or another colorless permanent you control triggers, that ability triggers$2.25
70%Freed from the Real Enchantment — AuraEnchant creature {U}: Tap enchanted creature. {U}: Untap enchanted creature.$8.64
76%Kiora's Follower Creature — Merfolk{T}: Untap another target permanent.$0.35
78%Illusionist's Bracers Artifact — EquipmentWhenever an ability of equipped creature is activated, if it isn't a mana ability, copy that ability. You may choose new targets f$6.57
74%Twinning Staff ArtifactIf you would copy a spell one or more times, instead copy it that many times plus an additional time. You may choose new targets f$16.46
74%Tezzeret the Seeker Legendary Planeswalker — Tezzeret+1: Untap up to two target artifacts. −X: Search your library for an artifact card with mana value X or less, put it onto the batt$25.64
74%Fable of the Mirror-Breaker // Reflection of Kiki-Jiki Enchantment — Saga // Enchantment Creature — Goblin ShamanFable of the Mirror-Breaker: (As this Saga enters and after your draw step, add a lore counter.) I — Create a 2/2 red Goblin Shama$6.37
79%Voltaic Key Artifact{1}, {T}: Untap target artifact.$3.69
74%Lithoform Engine Legendary Artifact{2}, {T}: Copy target activated or triggered ability you control. You may choose new targets for the copy. {3}, {T}: Copy target i$9.13
71%Unstoppable Plan EnchantmentAt the beginning of your end step, untap all nonland permanents you control.$2.26
Prices and legality come from Scryfall. Every card here was scored by the same search that runs when you type a question.
