A creature that is sacrificed may not be regenerated
FWC - Dragon Claw 120 Cherubi Ability: Sprightly Berry Prevent all effects of attacks from your opponents Pokmon done to this Pokmon (Damage is not an effect.) GC - Leafage 20 Snorunt W - Ice Breath Flip a coin
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If your deck does not have access to green, you might have to get more creative by using cards like Tithe, Pilgrims Eye, or even Demonic Tutor to put lands into your hand, cards like Mana Geyser, High Tide, or Caged Sun to get a big payoff, or mana rocks like Arcane Signet, Coalition Relic, and the Ravnica Signet cycle (Boros Signet, Izzet Signet, etc.) to speed things along at the risk of seeing them destroyed later
The one plus side to this situation is that Darkness Ablaze remains the cheapest set of the era to complete due to its lack of any form of chase card.