At first, I thought this might have something to do with the order that the decks were previewed (in theory, decks that are previewed first will have more time for their cards to decrease in price), but considering Sultai Morph was the first decklist released, this doesn't seem to be the case
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They have the very rare Meld mechanic, where you can pay five mana to fuse them together if theyre both on the battlefield
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
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