(6/16/2023) If a green mana you add has certain restrictions or riders associated with it (for example, if it was produced by Great Hall of the Citadel), they'll apply to that mana no matter when you spend it
Drop this and suddenly all your creatures become deadly threats, with double protection to make combat miserable for your opponents
There have been numerous spin-offs too
When this token is put into a graveyard, each opponent loses 1 life.) Instant Instant (CTRL to add secondary) Interaction Braids, Arisen Nightmare At the beginning of your end step, you may sacrifice an artifact, creature, enchantment, land, or planeswalker
Its especially great as a reactive play: Let your opponent go off, then flood the board with surprise tokens
Double Trouble is an instant that suddenly doubles the power of your entire board, which often turns what looks like a normal swing into a lethal one for multiple opponents