Erebos, God of the Dead [Theros] Zombie Dragon whenever either of those creatures

whenever either of those creatures deals combat damage

Set: Starter 1999 Type: Sorcery Rarity: Rare Cost: {2}{G} Green creatures you control gain forestwalk until end of turn

Set: Champions of Kamigawa Type: Enchantment Rarity: Uncommon Cost: {2}{W} Creatures can't attack you unless their controller pays {2} for each creature they control that's attacking you

or Dragon creature card from your hand onto the battlefield tapped and attacking that opponent

Set: Portal Three Kingdoms Type: Sorcery Rarity: Uncommon Cost: {1}{R} Rockslide Ambush deals damage to target creature equal to the number of Mountains you control

Erebos, God of the Dead [Theros] Zombie Dragon whenever either of those creaturesSet: Theros Type: Legendary Enchantment Creature God Rarity: Mythic Cost: {3}{B} Indestructible As long as your devotion to black is less than five, Erebos isn't a creature. (Each {B} in the mana costs of permanents you control counts toward your devotion to black.) Your opponents can't gain life. {1}{B}, Pay 2 life: Draw a card.