Ecks

Ecks enters the battlefield with X mana counters
on it, where X is the amount of mana spent to
cast it.
Whenever an opponent casts a spell or uses an
ability with X in its mana cost, you may pay X,
where X is that spell or abilitys converted mana
cost plus the number of mana counters on Ecks.
If you do, gain control of that spell or ability and
put a mana counter on Ecks.
Ach, a wouldnea cross em if a were ye.