The best Lost Caverns of Ixalan cards can help create brand-new decks, revitalise some old typal Commander ones and shape the next few months of competitive play
Adding 20 cards to your deck seems like a massive drawback that would hamper the consistency of your deck yet Yorion got the ban hammer in several formats, and some Modern decks still tinker with 80 cards, even without the extra creature in their sideboard
The re-introduction of Blossoming Defense and especially Spell Snare could also affect the Standard metagame never underestimate an interactive spell which always trades up on mana with the card it counters
Terminus is unique in that your opponents cant cast spells like Heroic Intervention to save their creatures
Kiora, Behemoth Beckoner Underappreciated Kiora, Behemoth Beckoner is half ramp, half Garruk's Uprising, and it starts off with high loyalty
The Reserved List, for those not in the know, is a list of cards that can never be reprinted