
Whenever Kellan attacks, reveal the top card of your library. If it's a creature card 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, put it into your hand. Otherwise, you may put it into your graveyard.
Create X Map tokensMap tokensThen exile this card. You may cast the creature later from exile., where X is one plus the number of opponents who control an artifact. (Then exile this card. You may cast the creature later from exile.)
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.