Fated Return

Exile target creature you control. It gains "At the beginning of your upkeep, if this creature is
exiled you may put a fate counter on it. If you
don't, return this creature to the battlefield with
X +1/+1 counters on it where X is the number
of fate counters on it, it gains indestructible until
end of turn. Then for each counter on this
creature it fights up to one other target creature."
"Remember me?"
—Marten, Dragonslayer