Jack Wild, Master Gambler

At the beginning of your upkeep, choose a
number for X from 1 to 5. Then, name a card.
Reveal the top card of your library. If it is the
named card, target opponent loses X life, you
gain X life, and Jack Wild, Master Gambler
gets +X/+X until end of turn. If it is not the
named card, you lose X life and tap Jack Wild,
Master Gambler.
"...you gotta know when to hold'em, know
when to fold'em..."