Rotting Mastodon [Khans of Tarkir] Two-Headed Giant Tournament Harbor Serpent can't attack unless

Harbor Serpent can't attack unless there are five or more Islands on the battlefield

Set: The Brothers' War Tokens Type: Token Artifact Creature — Zombie Rarity: Common

Set: Shards of Alara Type: Creature — Zombie Rarity: Common Cost: {1}{B} Unearth {B} ({B}: Return this card from your graveyard to the battlefield

Set: Kaldheim Type: Snow Creature — Zombie Berserker Rarity: Common Cost: {2}{B} {1}{S}: Grim Draugr gets +1/+0 and gains menace until end of turn

it is excellent To have a giant's strength

Rotting Mastodon [Khans of Tarkir] Two-Headed Giant Tournament Harbor Serpent can't attack unlessSet: Khans of Tarkir Type: Creature Zombie Elephant Rarity: Common Cost: {4}{B} Mastodons became extinct long ago, but foul forces of the Gurmag Swamp sometimes animate their decaying remains. The Sultai happily exploit such creatures but consider them inferior to their own necromantic creations.