The second knock is that Alena relies on either a steady flow of creature token generation, or a big turn with a flurry of cards for which some of your best cards are Ball Lightning, Bonecrusher Giant has more power than mana cost, and Cosmic Larva has a real drawback
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The following Q&A has been editorialized and lightly trimmed for better flow
This card would benefit a white-based artifact or enchantment deck that focuses on controlling the board with various artifacts and enchantments
Should he resolve, you're realistically going to have a 9/9 creature swinging in the following turn, with Trample