Mystic Genesis 
Instant
Counter target spell. Create an X/X green Ooze creature token, where X is that spell's mana value.
Legality
standardNOT LEGALpioneerLEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL
Instant
Counter target spell. Create an X/X green Ooze creature token, where X is that spell's mana value.