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From $1.75
'Whenever another creature you control enters, you gain life equal to that creature's toughness.
{1}{G}{W}, {T}: Populate. (Create a token that's a copy of a creature token you control.)
From $0.50
'Flying
When this creature enters, draw two cards.
Evoke {2}{U} (You may cast this spell for its evoke cost. If you do, it's sacrificed when it enters.)
From $2.75
'Whenever a creature is exiled from the battlefield, put a +1/+1 counter on this creature. At the beginning of your end step, you may exile another target creature you control,...
From $2.25
'As an additional cost to cast this spell, sacrifice a creature. Search your library for a creature card with mana value X or less, where X is 2 plus the...
From $16.00
When Terra enters, mill five cards. Put up to one enchantment card milled this way into your hand. Trance — {4}{R}{G}, {T}: Exile Terra, then return it to the battlefield...
From $3.25
'As an additional cost to cast this spell, sacrifice a creature. Search your library for a creature card with mana value X or less, where X is 2 plus the...
From $3.25
'At the beginning of each combat, double the power and toughness of each creature you control until end of turn.
From $9.00
'({T}: Add {B} or {R}.)
As this land enters, you may pay 2 life. If you don't, it enters tapped.
From $1.50
'Flying
Whenever you draw a card, Niv-Mizzet deals 1 damage to any target.
{T}: Draw a card.
From $0.75
'When this creature enters, you may search your library for up to two creature cards with mana value 1 or less, reveal them, put them into your hand, then shuffle.
From $0.75
'Whenever you cast an instant or sorcery spell, flip a coin. If you lose the flip, return that spell to its owner's hand. If you win the flip, copy that...