Sliced Sliver

If Sliced Sliver would enter and it wasn’t cast
or no mana was spent to cast it, exile it instead.

Hexproof, indestructible, vigilance, trample

Sliver creatures you control have +X/+X
where X is the number of non-token Slivers
you control.

You win the game if you control 15 or more
non-token slivers.