Aniguken, Cursed Son

When Aniguken, Cursed Son enters the battlefield, sacrifice him unless you tap one Cat
and one Sliver you control.
All Cat creatures you control are also Slivers, and
all Sliver creature you control are also Cats.
All Cats you control have lifelink and first strike
and they gain +1/+1, and all Slivers you control
have deathtouch and menace and "{t}: Add one
mana of any color".