When Scourge of Fleets enters the battlefield, return each creature your opponents control with toughness X or less to its owner's hand, where X is the number of Islands you control.
Flying {1}{R}: Scourge of Kher Ridges deals 2 damage to each creature without flying. {5}{R}: Scourge of Kher Ridges deals 6 damage to each other creature with flying.
Flying Dethrone Whenever Scourge of the Throne attacks for the first time each turn, if it's attacking the player with the most life or tied for most life, untap all attacking creatures. After this phase, there is an additional combat phase.
Flying, menace Whenever Screeching Scorchbeast attacks, each player gets two rad counters. Whenever one or more nonland cards are milled, you may create that many 2/2 black Zombie Mutant creature tokens. Do this only once each turn.
Scuttling Doom Engine can't be blocked by creatures with power 2 or less. When Scuttling Doom Engine dies, it deals 6 damage to target opponent or planeswalker.
Sealock Monster can't attack unless defending player controls an Island. {5}{U}{U}: Monstrosity 3. When Sealock Monster becomes monstrous, target land becomes an Island in addition to its other types.
Vigilance Whenever you cast a creature spell, create a 1/1 red Mercenary creature token with "{T}: Target creature you control gets +1/+0 until end of turn. Activate only as a sorcery." {T}: Choose a color. Add one mana of that color for each different power among creatures you control.