Hydra Omnivore [Conspiracy]

Hydra Omnivore [Conspiracy]Set: Conspiracy Type: Creature Hydra Rarity: Mythic Cost: {4}{G}{G} Whenever Hydra Omnivore deals combat damage to an opponent, it deals that much damage to each other opponent. "We should learn from the hydra. It never plays favorites; it devours everyone equally." Thrass, elder druid

Set: Gatecrash Type: Sorcery Rarity: Common Cost: {4}{W} Create two 2/2 white Knight creature tokens with vigilance

Set: Antiquities Type: Creature — Phyrexian Human Cleric Rarity: Common Cost: {1}{B} {T}

Set: EX: Ruby & Sapphire Type: Psychic Rarity: Uncommon Retreat cost: Colorless

"One day the mountain's fire will rise up to burn away our chains and end this age of oppression

it becomes an Aura with "enchant creature put onto the battlefield with Necromancy

Set: The List Type: Enchantment Rarity: Rare Cost: {3}{R} Whenever a creature enters the battlefield

Set: Ixalan Type: Legendary Creature — Vampire Cleric Rarity: Rare Cost: {2}{W} Whenever one or more nontoken Vampires you control attack

traveler—the main thing that'll change out there is you

Set: Dungeons & Dragons: Adventures in the Forgotten Realms Type: Enchantment Rarity: Rare Cost: {3}{W} At the beginning of your end step

and he was set adrift in the currents of time

000 Type: Artifact Creature — Necron Wizard Rarity: Uncommon Cost: {1}{B} Flying

how would I know it worked