Multiple cards sacrifice creatures to grow your board, but the decks not so token-heavy that it can just toss fodder away, and you dont really want to pump up your board at the expense of losing your creatures
Factor in that third ability, which lets Baylen go tall as well as wide, and you have one seriously flexible Commander
This is a subset consisting of 25 additional cards, where all the classic reprints will be found
The other three are supply issues
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These problems are then further complicated by blues mostly inconsistent history with mana ramp in the color pie