
FlyingFlyingCan only be blocked by creatures with flying or reach., lifelinklifelinkDamage dealt by this also causes you to gain that much life.
If you would gain life, you gain twice that much life instead.
When Selenia diesdiesA creature dies when it goes from the battlefield to a graveyard. Being exiled or returned to hand is not dying., create a legendary black Aura Curse enchantment token named Selenia's Curse attached to target opponent. The token has enchant player and "If enchanted player would lose life, they lose twice that much life 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.