Prairie Stream [Zendikar Expeditions] Leviathan Chief Commander can't attack unless

Chief Commander can't attack unless defending player controls an Island

This cost is reduced by {2} for each basic land type among lands you control

change Halfdane's base power and toughness to the power and toughness of target creature other than Halfdane until the end of your next upkeep

Whenever enchanted creature deals damage to a player

{T}: Ante Jeweled Bird

Prairie Stream [Zendikar Expeditions] Leviathan Chief Commander can't attack unlessSet: Zendikar Expeditions Type: Land Plains Island Rarity: Mythic ({T}: Add {W} or {U}.) Prairie Stream enters the battlefield tapped unless you control two or more basic lands.