If you are buying for draft night, look at Duskmourn, Tarkir: Dragonstorm, Bloomburrow, FINAL FANTASY or Secrets of Strixhaven
If the discovered card has in its mana cost, you must choose 0 as the value of X when casting it without paying its mana cost
In fact the printing of Unholy Heat (and to an extent Solitude) has mostly pushed out cards like Tarmogoyf out of the format, as the removal in the format is now so efficient that creatures either need to be one-mana, so you trade at an even level (Dragons Rage Channeler and Ragavan, Nimble Pilferer), too large to be killed by Unholy Heat (Deaths Shadow and Murktide Regent) or generate immediate value upon being played (Solitude, Fury and Omnath, Locus of Creation)
This deck runs lots of cards that use "charge counters", and ways to add or move those counters around