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This is because of an obscure game mechanic that on a single Chain, each player can only activate 1 monster's Trigger Effect that can Special Summon itself from the hand

Given the very high usage rate and win rate of decks that include black cards, and the fact that this card has the highest usage rate among cards that reduce cost, we have decided to designate this card as a Banned Card

The titular monsters all share one thing in common: once they are on the field, they command the pace of the game

I doubt thisll do too much to the value of the card, but we might see more of a drop if Wizards keeps reprinting it

Valakut All Ramp decks are hard to interact with for most decks, but Valakut is an extreme case