Start with the base damage printed to the right of the attack
Unless you want to focus on just one critter type (building Blech as insect tribal seems quite popular) you're probably going to want Blex in your deck, since it's the only card that will act as a lord for all of your creatures
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By taking into account the strength of each decks Face Commander, alternate Commanders, and the full MTG Bloomburrow Commander decklist as a whole, you should be one step closer to figuring out which Bloomburrow deck is set to be your new pet precon
Special Summon 1 Rank 10 or higher "Utopia" or "Utopic" Xyz Monster from your Extra Deck, by using that Xyz Monster you control as material
(However, if it's still in the graveyard at that time, it will count itself, as it is very much a hot card.) If another effect modifies how much damage your hot source would deal, including preventing some of it, the player being dealt damage or the controller of the permanent being dealt damage chooses an order in which to apply those effects