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When Worf enters, for each opponent, gain control of up to one target creature that player controls with 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. 3 or less until end of turn. Untap those creatures. Until end of turn, they become Warriors in addition to their other types and gain haste.
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.
