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As long as your curve can afford the 1 mana each turn, I think this green enchantment can stop, or at least slow down many aggro decks

A deck can have any number of cards named Slime Against Humanity

Giving your opponent access to that isn't always ideal, but you get it first, so I think it ends up benefitting you more often than it benefits them

Anticausal Vestige With Anticausal Vestige, youre getting 7 power for 4 mana, which is enough to fully station many spacecraft, and you also get a draw and a 4 mana or less card from your hand to the battlefield

You may need our MTG Companion, MTG Cascade, and MTG Hexproof guides

And last, but not least, we have Midnight Clock