Kaito, Bane of Nightmares (Borderless) [Duskmourn: House of Horror] Booster you may pay 0 rather

you may pay 0 rather than pay the mana cost for a colorless spell you cast from your hand

Set: Secret Lair Drop Series Type: Instant Rarity: Rare Cost: {1}{B/P}{B/P} Target creature gets -5/-5 until end of turn

and Human Sol Ring cards can only be found in some The Lord of the Rings: Tales of Middle-earth Collector Boosters

x2][When Attacking] Give up to 1 of your opponent's Characters -3000 power during this turn

Kaito, Bane of Nightmares (Borderless) [Duskmourn: House of Horror] Booster you may pay 0 ratherSet: Duskmourn: House of Horror Type: Legendary Planeswalker Kaito Rarity: Mythic Cost: {2}{U}{B} Ninjutsu {1}{U}{B} ({1}{U}{B}, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.) During your turn, as long as Kaito has one or more loyalty counters on him, he's a 3 4 Ninja creature and has hexproof. +1: You get an emblem with "Ninjas you control get +1 +1." 0: Surveil 2. Then draw