Aetherling
Creature — Shapeshifter
: Exile this creature. Return it to the battlefield under its owner's control at the beginning of the next end step.
: This creature can't be blocked this turn.
: This creature gets +1/-1 until end of turn.
: This creature gets -1/+1 until end of turn.
Tyler Jacobson
Pioneer Masters (PIO)
• #43Rulings
Aetherling's first ability will return it to the battlefield only if that ability also exiled it. If Aetherling left the battlefield in response to that ability, it won't return, even if it was exiled by another spell or ability.
(wotc • 2013-04-15)
Aetherling's last ability can be activated even if its power is 0 or less. If a creature would assign 0 or less damage in combat, it doesn't assign combat damage at all.
(wotc • 2013-04-15)
Rulings
Aetherling's first ability will return it to the battlefield only if that ability also exiled it. If Aetherling left the battlefield in response to that ability, it won't return, even if it was exiled by another spell or ability.
(wotc • 2013-04-15)
Aetherling's last ability can be activated even if its power is 0 or less. If a creature would assign 0 or less damage in combat, it doesn't assign combat damage at all.
(wotc • 2013-04-15)