Zaxara, the Exemplary [Dominaria United Commander] Hydra Set: 30th Anniversary Edition Type:

Set: 30th Anniversary Edition Type: Sorcery Rarity: Rare Cost: {X}{B} Target player discards X cards at random

but I believe a more mundane power source might suffice

Set: Dominaria Remastered Type: Land Rarity: Rare Gemstone Mine comes into play with three mining counters on it

III — Search your library for an artifact card with mana cost {0} or {1}

Zaxara, the Exemplary [Dominaria United Commander] Hydra Set: 30th Anniversary Edition Type:Set: Dominaria United Commander Type: Legendary Creature Nightmare Hydra Rarity: Mythic Cost: {1}{B}{G}{U} Deathtouch {T}: Add two mana of any one color. Whenever you cast a spell with {X} in its mana cost, create a 0 0 green Hydra creature token, then put X +1 +1 counters on it.