Coat of Arms and Changeling

[Captain_Morgan]

Coat of Arms I see at gatherer is:

Each creature gets +1/+1 for each other creature in play that shares a creature type with it. (For example, if a Goblin Warrior, a Goblin Scout, and a Zombie Goblin are in play, each gets +2/+2.)

So let's assume you have Mirrior Entity in play and 1 other creature, and activate his special ability. So for basically 1 mana+Coat of Arms they'd gain +X/+X or whatever the total amount of creature types in the games is?

[Jaiminho]

If a creature shares any of its types in any quantity with N other creatures, that creature will get +N/+N. So, activating Mirror Entity would give them a N boost on power and thoughness, given N creatures on the board (not yours, but everyone's).

EDIT - Corrected, since I had written N other creatures, not N creatures. Sorrey.

[Captain_Morgan]

So in other words:

Goblin Warrior, a Goblin Scout, and a Zombie Goblin are in play, each gets +2/+2

If they were Goblin Scout, another Goblin Scout, and a Goblin Scout are in play they only get +2/+2?

My interpretation was that they'd receive +2/+2 for Goblin and then +2/+2 for Scout. So in together since they had 2 creature types, they'd receive +4/+4.

So the check is only once for the creature?

[Nihil Credo]

Yes. CoA doesn't care how many creature types they share, only if a creature type is shared.

[Captain_Morgan]

Okay thanks you two.

[Julian23]

If a creature shares any of its types in any quantity with N other creatures, that creature will get +(N - 1)/+(N - 1). So, activating Mirror Entity would give them a N - 1 boost on power and thoughness, given N creatures on the board (not yours, but everyone's).

Why +N-1 / +N-1? I'd say it will be +N / +N because you said "other" creatures first. Just a minor mistake; in the last part of your post you got it right again :-).

[Nightmare]

Why +N-1 / +N-1? I'd say it will be +N / +N because you said "other" creatures first. Just a minor mistake; in the last part of your post you got it right again :-).

N = number of creatures (in his example). You are interpreting it as number of other creatures. It's a minor disparity.

[Jaiminho]

I had written N other creatures, so Julian was right. I should've read it again before posting. Edited for correctness.