G
Artifact
All creatures with power 5 get +2/+2
Pay 3 life: ~this~ is a artifact in addition to its other types (This effect doesn't end)

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WUB
Artifact
Discard a instant card, Pay 2 life: all artifacts are creatures with power and toughness equal to their converted mana cost in addition to their other types until end of turn

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BB
Creature - Spirit (1/1)
Whenever a creature regenerates, target opponent may pay X, where X is the number of colourless spells cast this turn. If that player doesn't, clash with an opponent. If you win, destroy all creatures. They can't be regenerated.
Sacrifice a creature with toughness 1 or less, Discard a creature card: draw a card

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AlexChurchill/MagicCardGenerator