If I have Omnath, Locus of Rage, Mirror Entity, and five other creatures in play and I activate Mirror Entity to make them all 0/0, does Omnath's ability see them all go to the graveyard as elementals?
Then SBE's are checked and they will all go the the graveyard (assuming no other pump abilities on the board). As they all go at the same time they will all trigger Omnath's ability. The last known info will be used for each creature, so it see's them as all creature types (including the necessary Elemental type for Omnath's ability). The ability will then resolve dealing 3 damage 7 times (however you want to aim it).
Both parts of Mirror Entity's ability happen at the same time so they all become base P/T 0/0 and all creature types (the 5 creatures, Mirror Entity and Omnath, Locus of Rage).
Then SBE's are checked and they will all go the the graveyard (assuming no other pump abilities on the board). As they all go at the same time they will all trigger Omnath's ability. The last known info will be used for each creature, so it see's them as all creature types (including the necessary Elemental type for Omnath's ability). The ability will then resolve dealing 3 damage 7 times (however you want to aim it).
http://www.cubetutor.com/visualspoiler/20765