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When you cast this spell, target opponent exiles the top half of their library, rounded up.
WardWardWhen this becomes the target of a spell or ability an opponent controls, counter it unless that player pays the ward cost.—Sacrifice two permanents.
Ulamog enters with a number of +1/+1 counters on it equal to the greatest mana valuemana valueThe total amount of mana in a card's cost, ignoring colour. A card costing 
has mana value 4. X counts as 0 except on the stack. among cards in exile.
Ulamog has annihilator X, where X is the number of +1/+1 counters on it.
Hover an underlined rule to see what it means.
Read from the rules text. A card that enables a keyword makes or is the thing; a card that rewards it gets better when you have it. Two cards interact when one enables what the other rewards.
