If two or more effects attempt to modify how many counters would be put onto a creature you control, you choose the order to apply those effects, no matter who controls the sources of those effects
Now continue your game and speak to the deliveryman in any Pokmon Center and hell give you the Mega Stones
While you could just stack this deck full of powerful Dimir Creatures like Wrexial, the Risen Deep, a zombie theme is much more fitting as it will help get cards in your graveyard and ensures there will be synergy with whatever creature you choose to copy
Valley Rally, Blooming Blast, and War Squeak show some of the cutest war criminals ever, but their names are also illustrative of Magic: The Gathering Bloomburrow as a whole
Im merely sharing my opinion
It doesnt seem like the kind of card that will take over games often enough