Joel, Coping Mechanic

{t}: Flip a coin. After each coin flip, you may choose to flip again. For each heads,
add {2}. This can be used to play or activate
an artifact. You can also play an artifact
with that many power from a graveyard,
or to crew a vehicle as if Joel had +1 Power.
For each tails, put a -1/-1 counter on Joel.