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'You may have this creature enter as a copy of a creature you control.
'Changeling (This card is every creature type.)
{X}: Until end of turn, creatures you control have base power and toughness X/X and gain all creature types.
'{T}, Sacrifice this creature: Exchange life totals with target opponent. Activate only during your upkeep.
'Bargain (You may sacrifice an artifact, enchantment, or token as you cast this spell.) Search your library for a card, exile it face down, then shuffle. If this spell was...
'{2}: This artifact becomes a copy of target artifact, creature, enchantment, or land until end of turn.
'Flying {1}{U}: This creature's owner shuffles it into their library. If that player does, they reveal cards from the top of that library until a card named Mirror-Mad Phantasm is...
'You may have this creature enter as a copy of a creature you control.
'{2}: This artifact becomes a copy of target artifact, creature, enchantment, or land until end of turn.
'The "legend rule" doesn't apply to permanents you control. Each legendary creature you control gets +1/+1. Each nontoken creature you control gets +1/+1 for each other creature you control with...
'Kicker {2} When Jace enters, if Jace was kicked, create a token that's a copy of Jace, except it's not legendary and its starting loyalty is 1. [+1]: Scry 2....
'If you would lose the game, instead shuffle your hand, your graveyard, and all permanents you own into your library, then draw seven cards and your life total becomes 20.
'If you would lose the game, instead shuffle your hand, your graveyard, and all permanents you own into your library, then draw seven cards and your life total becomes 20.