
IslandwalkIslandwalkThis creature can't be blocked as long as defending player controls an Island., swampwalkswampwalkThis creature can't be blocked as long as defending player controls an Island or a Swamp. (This creature can't be blocked as long as defending player controls an Island or a Swamp.)
Whenever Wrexial deals combat damage to a player, you may cast target instant or sorcery card from that player's graveyard without paying its mana cost. If that spell would be put into a graveyard, exile it instead.
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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.