Sarkhan, Soul Aflame {1}{U}{R}
Legendary Creature — Human Shaman
Dragon spells you cast cost {1} less to cast.
Whenever a Dragon you control enters, you may have Sarkhan become a copy of it until end of turn, except its name is Sarkhan, Soul Aflame and it's legendary in addition to its other types.
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Cards that do something similar expected a card that isn't here?
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Miirym, Sentinel Wyrm 88%
$7.15#1422
"Whenever another nontoken Dragon you control enters, create a token that's a copy of it, except the token isn't legendary."