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Flying, lifelink
You may play lands and cast spells from among cards in your graveyard you've surveilled this turn. If you cast a spell this way, you pay life equal to its mana value rather than paying its mana cost.
If you cast a spell with {X} in its mana cost this way, the only legal choice for X is 0.
You may only cast spells this way by paying the appropriate amount of life. You may not pay their normal costs and may not pay any other alternative costs. You may still pay for additional costs, such as kicker costs. If the spell has mandatory additional costs, you must pay those.
“Cards in your graveyard you’ve surveilled this turn” includes cards you put into your graveyard while surveilling. It does not include cards you saw while surveilling, left on top of your library, and then put into your graveyard later that turn by other means.
