Primordial Gnawer
Creature — Insect Horror
Cave crawlers devour anything from plant matter to solid rock, but they prefer fresh meat.
Rulings (9)
If you discover an adventurer card, split card, or modal double-faced card, you might be able to cast that card with either set of characteristics depending on the effect's discover value. For example, if you discover 4 and reveal Galvanic Giant (an adventurer card from Wilds of Eldraine with a mana value of 4), you could cast Galvanic Giant, but not Storm Reading (its Adventure, which has a mana value of 7). If you discover 7 and reveal Galvanic Giant, you could cast either Galvanic Giant or Storm Reading.
If the discovered card has X generic mana in its mana cost, you must choose 0 as the value of X when casting it without paying its mana cost.
If you can't cast the discovered card (perhaps because there are no legal targets for the spell), you'll put it into your hand.
Legality
Formats by platform