Mistwraith

At the beginning of your upkeep, exile a creature card in a graveyard at random, then roll a d20.

1 | Nothing happens.
2–14 | Put a number of +1/+1 counters on Mistwraith equal to half the total power and toughness of the exiled creature, rounded down.
15–19 | Mistwraith gains a random ability from the exiled creature.
20 | The effects of rolls 2–19 apply.