Burrowing Reaver

Trample
{x}{b/g}{b/g}{b/g}{b/g}: Monstrosity X.
Burrowing Reaver doubles all +1/+1 counters
applied to it.
{t}: Burrow — Burrowing Reaver gets hexproof and
can't be targeted by any spell, creature, or ability until
your next untap phase. When it burrows, it loses all
-X/-X counters applied to it.