Its best when you have your own +1/+1 counter cards, planeswalkers, or spacecraft to take advantage of the free proliferate, even if the Peacemaker eats up a removal spell
Of course, the card is not at its best against a majority of colours without additional card draw
Castle of Dragon Souls X TRAP Continuous Once per turn: You can banish 1 Dragon monster from your GY, then target 1 monster you control
Those abilities can be put on the stack in either order (if you control them both), and they'll both resolve before the spell that caused them to trigger
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