If Ezreal dashing comes into a battlefield and initiates a showdown as an attacker against a Teemo Strategist, what is the sequence of effects between the two cards for how damage is applied and when?

In this combat showdown, the sequence is determined by the standard combat timing flow where triggered abilities from the attacker are placed on the chain before those of the defender.

The Sequence

1. Combat Begins: Ezreal, Dashing moves to the battlefield and becomes the Attacker. Teemo, Strategist is the Defender.
2. Triggers are placed on the chain:
   • Ezreal's "When I attack" trigger is placed on the chain first (as the Active Player/Attacker).
   • Teemo's "When I defend" trigger is placed on the chain second (as the Non-Active Player/Defender).
3. The Chain Resolves (LIFO - Last-In, First-Out):
   • Teemo's ability resolves first: You choose an enemy unit at the battlefield and reveal the top 5 cards of your main deck. You deal 1 damage to the chosen unit for each [Hidden] card revealed, then recycle the cards.
   • Ezreal's ability resolves second: It checks Ezreal's current Might and deals 3 damage to the targeted enemy unit.

Key Rulings and Interactions

• Trigger Order: Because Ezreal is the Attacker, his trigger goes on the chain first. Because Teemo is the Defender, his trigger goes on the chain second. The LIFO rule causes Teemo’s ability to resolve before Ezreal’s (see RiftJudge FAQ #8547 for the general rule on Attacker vs. Defender trigger timing).
• No Combat Damage: Both Ezreal, Dashing and Teemo, Strategist (due to Ezreal's text) have abilities that specify they deal damage through their effects. Ezreal specifically states, "I don't deal combat damage."
• Survival: If Teemo's ability deals enough damage to kill Ezreal before his trigger resolves, Ezreal will leave the battlefield and go to the trash. When Ezreal's ability attempts to resolve, if he is no longer "here" (at the battlefield), the ability will "whiff" and fail to deal its 3 damage, as it requires a target at that location (see RiftJudge FAQ #7639).
• Dynamic Might: As noted in RiftJudge FAQ #9638, Ezreal’s ability checks his Might at the moment of resolution, not when the trigger is placed on the chain.