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These splotches can occur for all manner of reasons

Similarly, if a red and white spell's effect causes it to deal damage to one thing and then deal more damage with a second instance of the word "deals," Firesong and Sunspeaker's last ability triggers twice, and so on

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So, it can act as a backup if your commander is taken out too many times and you are having difficulty casting him

This mechanic has been so effective that weve actually seen fewer transformation mechanics and seen sets with as few as one Transform card to tell a story (Nicol Bolas, the Ravager in M19)