1W
Creature - Giant Soldier (3/2)
When ~this~ is put into a graveyard from the battlefield, you may Pay 3 life. If you do, clash with an opponent. If you win, regenerate target untapped nonred creature

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1B
Artifact Creature - Spirit (3/1)
Pay 4 life: two target creatures with total power and toughness X or less, where X is your life total get -4/-4 until end of turn

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1WW
Creature - Human Knight (1/2)
Whenever an opponent gains life, target opponent may search his or her library for a enchantment card, reveal it, and put it into its owner's graveyard. If that player does, that player shuffles that library afterwards.
When ~this~ enters the battlefield, two target creatures with total power and toughness X or less, where X is the number of tapped creatures you control get +3/+3 until end of turn

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AlexChurchill/MagicCardGenerator