Sundering Eruption // Volcanic Fissure

If an effect allows you to play a land or cast a spell from among a group of cards, you may play or cast a modal double-faced card with any face that fits the criteria of that effect. For example, if an effect allows you to play lands from your graveyard, you can play Garden of Freyalise, but you can't cast Disciple of Freyalise.

The effect of Sundering Eruption prevents all creatures without flying from blocking that turn, including creatures that lose flying after Sundering Eruption resolves and creatures without flying that enter the battlefield later in the turn. Creatures without flying that gain flying later in the turn will be able to block if they have flying when blockers are being declared.

To determine whether it is legal to play a modal double-faced card, consider only the characteristics of the face you're playing and ignore the other face's characteristics. For example, if an effect stops you from casting creature spells, you can't cast Disciple of Freyalise, but you can still play Garden of Freyalise.