Cards with a rarity from Common to Legendary are meant for gameplay, with each having a foil variant that can get pulled from Starter Decks and booster packs
First off, the return of double-faced cards
Let's look at the stock list: Revival Trance is a focused Graveyard deck: I count 19 cards that put creatures into the graveyard either through milling or discarding and 25 cards that care about your graveyard, mostly reanimation but a bit of other stuff too
If you don't, the ability won't trigger at all
She turns them into doubles of her power and won't need long to break into her with enough landfall for a 20 damage win in Five Color or Commander Damage win in those formats too
This MTG commander gains +1/+1 counters and pings everyone whenever you cast a non-creature spell, but more importantly for this particular interaction, it also has a free activated ability that makes mana