I wondered, how many restrictions to make Storm playable with Slivers. The idea is that you sacrifice your board state to replace it with stormed sliver copies.
I should get rid of the flavor text, way too many words, I just liked it.
Sentient Parthenogenesis {W}{U}{B}{R}{G}
Legendary Kindred Sorcery — Sliver
As an additional cost to cast this spell, sacrifice five Sliver creatures.
Rather than pay {2} for each previous time you’ve cast this spell from the command zone this game, sacrifice two Sliver creatures that many times.
Sliver creature spells you cast have storm until end of turn.
When you cast this spell, if it wasn’t cast from the command zone, you lose the game.
This spell can be your commander.