U
Creature - Merfolk Wizard (2/1)
2, Discard a land card: target nonlegendary land can't be the target of activated abilities (This effect doesn't end)
Whenever ~this~ regenerates, target creature with both power and toughness 3 or less gets -2/-0 until end of turn and tap that creature

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W
Instant
regenerate target creature with power X or less, where X is the number of instant spells cast this turn

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R
Creature - Rat Shaman (1/2)
T, Sacrifice a permanent: put a +1/+1 counter on ~this~
Sacrifice a nonbasic land, remove a +1/+1 counter from ~this~: all white creatures can't block (This effect doesn't end)
Sacrifice a green creature: each player loses the sacrificed creature's total power and toughness life
~this~ can't block as long as ~this~ is untapped

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AlexChurchill/MagicCardGenerator