Card

Nyxbloom Ancient

Mana cost {4}{G}{G}{G}

Trample If you tap a permanent for mana, it produces three times as much of that mana instead.

Part of 621 known combos, 6 of them two-card. 4 official rulings.

Bracket

B1 Exhibition — Not in the same deck as its two-card combo partners: Basalt Monolith, Grim Monolith, Freed from the Real, Pemmin's Aura, Rite of Replication, Palinchron
B2 Core — Not in the same deck as its two-card combo partners: Basalt Monolith, Grim Monolith, Freed from the Real, Pemmin's Aura, Rite of Replication, Palinchron
B3 Upgraded — Not in the same deck as its early two-card combo partners: Basalt Monolith, Grim Monolith, Freed from the Real, Pemmin's Aura
B4 Optimized — allowed: No restriction beyond the banned list
B5 cEDH — allowed: No restriction beyond the banned list

Two-card combo with Basalt Monolith, Grim Monolith, Freed from the Real, Pemmin's Aura, Rite of Replication, Palinchron (early with Basalt Monolith, Grim Monolith, Freed from the Real, Pemmin's Aura)

Bracket: Lotus Vault analysis, with Commander Spellbook flags

621 known combos, 6 of them two-card.

2020-01-24 · Wizards of the Coast
If an ability triggers “whenever you tap” something for mana and produces mana, that triggered mana ability won’t be affected by Nyxbloom Ancient.
2020-01-24 · Wizards of the Coast
Nyxbloom Ancient doesn’t produce any mana itself. Rather, it causes permanents you tap for mana to produce more mana. If the mana ability of that permanent puts any restrictions or riders on the mana it produces, that will apply to all the mana it produces this way.
2020-01-24 · Wizards of the Coast
You’re “tapping a permanent for mana” only if you’re activating a mana ability of that permanent that includes the {T} symbol in its cost. A mana ability produces mana as part of its effect.
2020-01-24 · Wizards of the Coast
The effects of multiple Nyxbloom Ancients are cumulative. For example, if you have two Nyxbloom Ancients on the battlefield, you’ll get nine times the original amount and type of mana.

Rulings: Scryfall · Wizards of the Coast