Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight

Flying, lifelink

Creature spells you cast have convoke. (Your creatures can help cast those spells. Each creature you tap while casting a creature spell pays for 1 or one mana of that creature's color.)

At the beginning of your first main phase, you may pay B. If you do, transform Eirdu.

Flying, lifelink

Each other nontoken creature you control has persist. (When it dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.)

At the beginning of your first main phase, you may pay W. If you do, transform Isilu.