S.A.M.

Hexproof Trample

{t},{r}{r}— Put +1/0 counter on S.A.M.
{2}{p/r}{p/r}— Untap S.A.M.
When the number of positive counters on
S.A.M. reaches 10, you may sacrifice S.A.M.,
if you do, deal X damage to target player, where X
is a number of positive counters on S.A.M.
Whenever S.A.M. should leave the battlefield, transform it instead.