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Trickster's Elk You want to say Trickster's Elk is like removal, and granted, switching off the busted activated abilities on a key creature is impactful in a singleton format, just make sure you don't care about your opponent controlling a non-flying 3/3 because you might accidentally improve an opposing creature with +1/+1 counters

With that all being said I predict this card to be PSA 7

The first is to destroy any creature or planeswalker, making it a Hero's Downfall for one more mana

This is a special ability - which could be a static effect (Jinx's Loose Cannon legend draws you an extra card if you start the turn with one or less) or an activated ability (Darius's legend taps for 'mana' if you've already played a card that turn)

The super-cheap planeswalkers will come down in price, but much like the Elementals from MH2, I expect them to get high again if they start getting playset-popular