RiftRef
Riftbound Unit: Rift Herald. When I move to a battlefield, look at the top 3 cards of your Main Deck. You may reveal a unit from among them and draw it. Recycle the rest. [Deathknell][>] Play a unit from your hand to your base, ignoring its Energy cost. (When I die, get the effect. You must still pay its Power cost.)

Card Rulings

Rift Herald

UNL-179/219 · Unleashed · Epic

UnitOrder
Energy
8
Might
7
Power
1

Printed Ability

When I move to a battlefield, look at the top 3 cards of your Main Deck. You may reveal a unit from among them and draw it. Recycle the rest. [Deathknell][>] Play a unit from your hand to your base, ignoring its Energy cost. (When I die, get the effect. You must still pay its Power cost.)

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Official Context Linked to This Card

FAQ: Unleashed Rules FAQ and Clarifications

Rift Herald is an interesting card. Usually, we don't print effects like Rift Herald's Deathknell that don't say "may." However, even without the "may," an important principle that we want to hold for Riftbound is that game effects cannot force a player to perform a game action on an object with specific characteristics whose information status is private.