If more than one creature enters the battlefield at the same time, or if one or more other creatures enter the battlefield at the same time that Griffin Protector enters the battlefield, Griffin Protector's triggered ability triggers for each of them.
2012-07-01
If Griffin Protector enters under your control at the same time as other creatures, its ability will trigger once for each of those creatures.
Flying
Whenever another creature you control enters, this creature gets +1/+1 until end of turn.
