Cavern of Souls (0410e) (Borderless) [The Lost Caverns of Ixalan] Summon Dragon-God has all loyalty abilities

Dragon-God has all loyalty abilities of all other planeswalkers on the battlefield

but this is not always possible

Set: Battle for Zendikar Prerelease Promos Type: Enchantment Rarity: Rare Cost: {3}{G} Devoid (This card has no color

Set: Innistrad: Crimson Vow Prerelease Promos Type: Legendary Creature — Slug Horror Rarity: Mythic Cost: {5}{B}{B} At the beginning of each end step

Serpentine Wood enters the battlefield

Cavern of Souls (0410e) (Borderless) [The Lost Caverns of Ixalan] Summon Dragon-God has all loyalty abilitiesSet: The Lost Caverns of Ixalan Type: Land Rarity: Mythic As Cavern of Souls enters the battlefield, choose a creature type. {T}: Add {C}. {T}: Add one mana of any color. Spend this mana only to cast a creature spell of the chosen type, and that spell can't be countered.