That turns any decent Boros aggro archetype into an overwhelming combat machine that accrues rapid value with just a few attacks
23 featured Ascended Heroes ETBs
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In return, you draw two cards and gain the ability to play an extra land that turn (two powerful advantages)
Games would all come down to players trying to flip heads on that card first, and the entire game would be left in jeopardy
For example, Monastery Swiftspear would get two instances of prowess if Bria, Riptide Rogue is on the board, so casting Brainstorm would give Monastery Swiftspear +2/+2 until end of turn