Sammy, Mind Undaunted

When an opponent discards a card, you may pay {u} to draw one card and then discard one card. If
you do, add a +1/+1 counter to Sammy, Mind Undaunted.
{x}{x}{r}{r}{r} as an additional cost, remove X
counters from Sammy, Mind Undaunted. Each opponent discards X cards and takes X damage.
Adamant- If at least three green mana was spent
to cast this card, it enters the battlefield with
three +1/+1 counters.