First strike (This creature deals combat damage before creatures without first strike.)Protection from black (This creature can't be blocked, targeted, dealt damage, or enchanted by anything black.)
Flying: Prevent the next X damage that would be dealt to you this turn. If damage is prevented this way, Vengeful Archon deals that much damage to target player or planeswalker.
At the beginning of each player's upkeep, that player reveals a card at random from their hand. If it's a land card, the player puts it onto the battlefield. Otherwise, the player casts it without paying its mana cost if able.
Islandwalk (This creature can't be blocked as long as defending player controls an Island.)Whenever Merfolk Spy deals combat damage to a player, that player reveals a card at random from their hand.
Exile all creatures you control, then reveal cards from the top of your library until you reveal that many creature cards. Put all creature cards revealed this way onto the battlefield, then shuffle the rest of the revealed cards into your library.
FlyingWhenever Conundrum Sphinx attacks, each player chooses a card name. Then each player reveals the top card of their library. If the card a player revealed has the name they chose, that player puts it into their hand. If it doesn't, that player puts it on the bottom of their library.
Enchant creatureEnchanted creature has "At the beginning of your upkeep, sacrifice this creature."When enchanted creature dies, its controller chooses target creature one of their opponents controls. Return Necrotic Plague from its owner's graveyard to the battlefield attached to that creature.