Ninja of the Deep Hours [Commander 2015] Snake and more can be found

and more can be found in Star Pack: VRAINS

The flashback cost is equal to its mana cost

Set: Eldritch Moon Prerelease Promos Type: Sorcery Rarity: Rare Cost: {1}{G}{G} As an additional cost to cast this spell

or three targets

Set: Eighth Edition Type: Creature — Kraken Rarity: Rare Cost: {5}{U}{U}{U} Tidal Kraken can't be blocked

Ninja of the Deep Hours [Commander 2015] Snake and more can be foundSet: Commander 2015 Type: Creature Human Ninja Rarity: Common Cost: {3}{U} Ninjutsu {1}{U} ({1}{U}, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.) Whenever Ninja of the Deep Hours deals combat damage to a player, you may draw a card.