AI DraftFeb 26, 2026
Priest of Titania + Umbral Mantle
Overview
Priest of Titania taps for 
equal to the number of Elves on the battlefield (including itself) [Ruling 2024-06-07]. Umbral Mantle gives the equipped creature an activated ability that costs 
and 
(untap) as part of the cost; the untap is paid as a cost and can’t be responded to [Ruling 2008-05-01]. The equipped creature’s controller is the only player who can activate the granted ability . Using those pieces together lets you tap Priest to make mana, pay to activate Mantle (untapping Priest as a cost), then tap Priest again to make the same amount of mana; the net mana per cycle is (Elves on battlefield) − 3, so if there are 4 or more Elves you can generate a positive net mana each cycle and loop to produce arbitrarily large amounts of green mana.
equal to the number of Elves on the battlefield (including itself) [Ruling 2024-06-07]. Umbral Mantle gives the equipped creature an activated ability that costs and (untap) as part of the cost; the untap is paid as a cost and can’t be responded to [Ruling 2008-05-01]. The equipped creature’s controller is the only player who can activate the granted ability . Using those pieces together lets you tap Priest to make mana, pay to activate Mantle (untapping Priest as a cost), then tap Priest again to make the same amount of mana; the net mana per cycle is (Elves on battlefield) − 3, so if there are 4 or more Elves you can generate a positive net mana each cycle and loop to produce arbitrarily large amounts of green mana.Step 1
Start with Umbral Mantle attached to Priest of Titania and control N Elves total (N includes Priest) [Ruling 2024-06-07].
Step 2
With Priest untapped, activate Priest’s ability: 
: Add for each Elf on the battlefield, producing N green mana [Ruling 2024-06-07].
: Add for each Elf on the battlefield, producing N green mana [Ruling 2024-06-07].Step 3
Use of that mana to pay the activation cost of the ability Umbral Mantle grants (, : This creature gets +2/+2 until end of turn). Paying the untap symbol is part of the cost and untaps Priest as the cost payment [Ruling 2008-05-01].
of that mana to pay the activation cost of the ability Umbral Mantle grants (, : This creature gets +2/+2 until end of turn). Paying the untap symbol is part of the cost and untaps Priest as the cost payment [Ruling 2008-05-01].Step 4
After the Mantle activation’s cost is paid (including untapping Priest), the ability is on the stack; the untap already occurred and can’t be responded to [Ruling 2008-05-01].
Step 5
Now Priest is untapped again, so you may activate Priest’s ability again to produce another N green mana [Ruling 2024-06-07].
ability again to produce another N green mana [Ruling 2024-06-07].Step 6
Net mana per complete cycle = N (mana produced by Priest tapping) − 3 (mana spent to activate Mantle). If N ≥ 4 the net is ≥ 1, so you can repeat the cycle to generate arbitrarily large amounts of green mana.
Resolution
If Priest of Titania is equipped with Umbral Mantle and you control the equipped creature, you may use Priest to produce mana, pay to activate the Mantle ability (untapping Priest as part of that cost) and then tap Priest again to produce mana [Ruling 2008-05-01]. Priest counts all Elves on the battlefield when producing mana, including itself and opponents’ Elves [Ruling 2024-06-07]. The net mana gained each loop is (number of Elves) − 3; with 4 or more Elves this nets at least +1 mana per loop, so you can repeat the loop to generate arbitrarily large amounts of green mana.
to activate the Mantle ability (untapping Priest as part of that cost) and then tap Priest again to produce mana [Ruling 2008-05-01]. Priest counts all Elves on the battlefield when producing mana, including itself and opponents’ Elves [Ruling 2024-06-07]. The net mana gained each loop is (number of Elves) − 3; with 4 or more Elves this nets at least +1 mana per loop, so you can repeat the loop to generate arbitrarily large amounts of green mana.Feedback