Sky's the Limit

` Stain {g} (You may cast this spell for its stain
` cost. If you do, it becomes color the same as
` mana spent to cast it until end of turn.)

` Tap X untapped creatures you control then
` target creature gains reach and gets +X/+0
` until end of turn. If Sky's the Limit is green,
` target creature instead gains reach and gets
` +X/+X until end of turn.

Sometimes fun can lead disaster.