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Commander
When Mairsil enters, you may exile an artifact or creature card from your hand or graveyard and put a cage counter on it. Mairsil has all activated abilities of all cards you own in exile with cage counters on them. You may activate each of those abilities only once each turn.

Commander
Draw
Other blue creatures you control have "Whenever this creature becomes tapped, draw a card, then discard a card." Other artifact creatures you control get +1/+1. {U/P}: Until end of turn, target creature you control becomes a blue artifact in addition to its other colors and types. Activate only as a sorcery. ({U/P} can be paid with either {U} or 2 life.)

Draw
Protection
Squad {2} (As an additional cost to cast this spell, you may pay {2} any number of times. When this creature enters, create that many tokens that are copies of it.) This creature can't block. Endurant — Pay 3 life: This creature gains indestructible until end of turn.

{B}: This creature gains menace until end of turn. {B}: This creature gains deathtouch until end of turn. {B}: This creature gains undying until end of turn. (When this creature dies, if it had no +1/+1 counters on it, return it to the battlefield under its owner's control with a +1/+1 counter on it.) {1}: This creature gets +1/-1 or -1/+1 until end of turn.

Protection
Untap
Untap
Blink
Blink
Finisher
Finisher
Ramp
Moonfolk offering (You may cast this spell any time you could cast an instant by sacrificing a Moonfolk and paying the difference in mana costs between this and the sacrificed Moonfolk. Mana cost includes color.) Flying {1}: Put up to two land cards from your hand onto the battlefield tapped.

This artifact enters under the control of an opponent of your choice. {2}, {T}: Draw a card, then you may put a land card from your hand onto the battlefield. This artifact's owner draws a card, then that player may put a land card from their hand onto the battlefield.

Ramp
Board Wipe
Board Wipe
Haste enabler
Haste enabler
Recursion
All Nightmares get +1/+1. {B}{B}{B}, Pay 3 life: Put target creature card from a graveyard onto the battlefield under your control. That creature is black and is a Nightmare in addition to its other creature types. When Chainer leaves the battlefield, exile all Nightmares.

{T}: Exile target instant or sorcery card from a graveyard. Roll a d20. Activate only as a sorcery. 1—9 | Copy that card. You may cast the copy. 10—19 | Copy that card. You may cast the copy by paying {1} rather than paying its mana cost. 20 | Copy each card exiled with this artifact. You may cast any number of the copies without paying their mana costs.

Recursion
Copy
Create a token that's a copy of target creature you control, except it isn't legendary. Rebound (If you cast this spell from your hand, exile it as it resolves. At the beginning of your next upkeep, you may cast this card from exile without paying its mana cost.)

Copy
Land
This land enters tapped. {T}: Add one mana of any color in your commander's color identity. When that mana is spent to cast a creature spell that shares a creature type with your commander, scry 1. (Look at the top card of your library. You may put that card on the bottom.)

Land
Removal
When Ovinomancer enters, sacrifice it unless you return three basic lands you control to their owner's hand. {T}, Return Ovinomancer to its owner's hand: Destroy target creature. It can't be regenerated. That creature's controller creates a 0/1 green Sheep creature token.

Removal
Infinite Combo
{U}: This creature gains all activated abilities of target creature until end of turn. (If any of the abilities use that creature's name, use this creature's name instead.) You may spend blue mana as though it were mana of any color to pay the activation costs of this creature's abilities.

Infinite Combo
Maybeboard
Maybeboard
Tutor
You may pay {2}{R}{R} rather than pay this spell's mana cost. If the {2}{R}{R} cost was paid, an opponent discards any number of cards, then draws that many cards. Search your library for up to three cards, put them into your hand, shuffle, then discard three cards at random.
