
FlyingFlyingCan only be blocked by creatures with flying or reach., vigilancevigilanceAttacking doesn't cause this creature to tap., indestructibleindestructibleDamage and effects that say "destroy" don't destroy it.
When The Sentry enters, target opponent creates The Void, a legendary 5/5 black Horror Villain creature token with flyingflyingCan only be blocked by creatures with flying or reach., indestructibleindestructibleDamage and effects that say "destroy" don't destroy it., and "The Void attacks each combat if able."
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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.