Hyper Sonic

indestructible, double strike, reach
Casualty X (As you cast this spell, you may
sacrifice a creature with power X. When
you do, copy this spell its power is X/X
and it's not legendary.)
When any Hyper Sonic attacks create a
Chaos Emerald token (They're artifacts with
"Tap, Sacrifice this artifact: Add one mana of any
color or chosen opponent discards a card or add
a +1/+1 counter to a chosen creature)