On the same note, Kindred DominanceKindred Dominance will also likely leave other players shields-down, but it exchanges the creatures-in-play requirement for a higher mana cost
Outside of this, its generically a good card for Mono-Black Aggro in Pioneer, and Rogues in Standard
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The defending player can then choose whether to play a Counter card from their hand, trashing a character card in order to add the specified Counter value to the defending card's power or an event card to activate the effect as explained on the card
Essentially, if you have a full party with all four of these on the board, you can pay one white, one blue, and one black mana to give the Warrior lifelink, deathtouch, and make him unblockable (deathtouch and unblockable at the same time has no real use, but thats still OP to think about)