Mega Venusaur

(Mega cards can only be played as commanders.)
As an additional cost to cast this spell, sacrifice a
creature named Venusaur and attach any cards or
counters from that creature to this Mega card.
Mega Venusaur can't have -1/-1 counters on it.
Whenever a player adds {r} untap Mega Venusaur
and it gains first strike until end of turn.
{g}, {t}, Exert Mega Venusaur: Add {g}{g}{g}.
Whenever Mega Venusaur next untaps, it deals
damage equal to its total power and toughness
to target p