5th Edition

Flying (This creature can't be blocked except by creatures with flying or reach.) {R}: Shivan Dragon gets +1/+0 until end of turn.

Sea Serpent can't attack unless defending player controls an Island. When you control no Islands, sacrifice Sea Serpent.

Sacrifice an artifact: Atog gets +2/+2 until end of turn.

Whenever Reef Pirates deals damage to an opponent, that player puts the top card of their library into their graveyard.

Defender (This creature can't attack.) {0}: Dark Maze can attack this turn as though it didn't have defender. Exile it at the beginning of the next...

{T}: D'Avenant Archer deals 1 damage to target attacking or blocking creature.

Flying

Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)

Whenever Labyrinth Minotaur blocks a creature, that creature doesn't untap during its controller's next untap step.

Clockwork Steed enters the battlefield with four +1/+0 counters on it. Clockwork Steed can't be blocked by artifact creatures. At end of combat, if...

Protection from white {B}: Knight of Stromgald gains first strike until end of turn. {B}{B}: Knight of Stromgald gets +1/+0 until end of turn.

Mountainwalk (This creature can't be blocked as long as defending player controls a Mountain.)

Flying, trample At the beginning of your upkeep, sacrifice a creature other than Lord of the Pit. If you can't, Lord of the Pit deals 7 damage to you.

Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.) Haste (This creature can attack and {T} as soon...

Whenever Marsh Viper deals damage to a player, that player gets two poison counters. (A player with ten or more poison counters loses the game.)

Whenever Murk Dwellers attacks and isn't blocked, it gets +2/+0 until end of combat.

{T}: Target creature with power 2 or less can't be blocked this turn.

Whenever Chub Toad blocks or becomes blocked, it gets +2/+2 until end of turn.

At end of combat, put a -0/-2 counter on each creature blocking or blocked by Greater Werewolf.

Protection from black

{U}: Homarid Warrior gains shroud until end of turn and doesn't untap during your next untap step. Tap Homarid Warrior. (A creature with shroud can...

Trample Whenever Aurochs attacks, it gets +1/+0 until end of turn for each other attacking Aurochs.

First strike, haste