Player 1 has Master Yi, Wuju Bladesman as his legend, and is holding a battlefield with Stalwart Poro. It is player 2's turn, and he plays an Accelerated Thousand-Tailed Watcher. He then moves the watcher to the battlefield held by the Stalwart Poro. How much might does the Poro have when defending?

To determine the Stalwart Poro's Might, we must follow the sequence of events and the timing of the abilities involved.

Sequence of Events

1. Player 2 plays Thousand-Tailed Watcher: This is a "When you play me" triggered ability, which uses the chain.
2. Watcher's Trigger Resolves: The ability gives enemy units (the Poro) -3 Might (to a minimum of 1). Since the Poro has 2 base Might, it is reduced to 1 Might.
3. Movement to Battlefield: Player 2 moves the Watcher to the battlefield occupied by the Stalwart Poro.
4. Showdown Begins: Moving a unit to an occupied battlefield initiates a combat showdown. The Poro is designated as the defender.

Might Calculation

• Base Might: 2
• Thousand-Tailed Watcher Effect: -1 (The reduction is capped at 1 Might, so the 2 Might Poro is reduced by 1, not 3).
• Master Yi (Wuju Bladesman) Passive: +2 (The Poro is defending alone).
• Stalwart Poro Shield: +1 (The Poro has the Shield keyword, which grants +1 Might while defending).

Final Calculation: 2 (Base) - 1 (Watcher) + 2 (Master Yi) + 1 (Shield) = 4 Might.

Ruling Notes

• Master Yi's Passive: According to FAQ #3611, Master Yi's ability is a passive that applies as long as the condition (defending alone) is met. Unlike triggered abilities that snapshot, this buff is active as long as the Poro is the only defender.
• Shield Stacking: According to Rule 814.1.c and FAQ #9493, the Shield keyword grants +1 Might while defending.
• Watcher's Debuff: According to FAQ #1580, the Watcher's effect snapshots the reduction at the time of resolution. The Poro's Might was reduced to 1 at that moment, and that -1 reduction persists for the turn.

The Stalwart Poro will have 4 Might while defending.