Holo enclosed
Mana Vault is solid ram early and gets out of hand with Unwinding clock, Voltaic Key, or Tezzeret the Seeker out.Time Sieve is generally used for combos but is just generally a cool card, so if you find yourself with lots of thopters or something can be nice.Maze of Ith is just nice to hose voltron decks or avoid getting blown out by a Hellkite Tyrant.Gate to the AEther lets you repeatably get all the great permanents in your deck once you get to 8 mana
While the power cards can lead to some wildly explosive turn ones, including just straight victories, the format is really all about interaction
Teal Mask Ogerpon Ex, Hearthflame Mask Ogerpon Ex, Wellspring Mask Ogerpon Ex, and Cornerstone Mask Ogerpon Ex - these cards are all great, but especially Energy-acceleration decks with Teal Mask Ogerpon Ex, Wellspring Mask in Ogerpon or Lugia decks, and Cornerstone Ogerpon in control decks where a wall Pokemon can make the difference
Other creatures have similar stax effects
We discuss the starter sets in detail in our review here