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Overview
If Abdel Adrian is already on the battlefield exiling your other nonland permanents, and Felidar Guardian enters and you target Abdel with Felidar’s ETB, Felidar will exile Abdel and then return it. Because those permanents were exiled “until Abdel Adrian leaves the battlefield,” they return as soon as Abdel leaves (when Felidar’s ability exiles him), then Felidar’s ability returns Abdel to the battlefield, causing Abdel’s enter-the-battlefield ability to trigger again if it can. Note that you cannot target a permanent that is already exiled (it isn’t a permanent), and if any of the things exiled by Abdel were tokens they cease to exist while exiled ; also a commander owner may choose to put Abdel into the command zone instead of exile, which changes whether Felidar can return him .
Step 1
Start with Abdel Adrian already on the battlefield and having exiled some number of your other nonland permanents with his ETB (those permanents are in exile 'until Abdel Adrian leaves the battlefield'). Keep those exiled cards in a distinct pile as per .
Step 2
Felidar Guardian enters the battlefield under your control and its triggered ability goes on the stack. As part of putting that trigger on the stack you choose the target (a permanent you control on the battlefield) per . You may choose Abdel as the target.
Step 3
When Felidar’s triggered ability resolves it first exiles the targeted permanent (Abdel). As soon as Abdel leaves the battlefield, the permanents he had exiled with his ETB are no longer exiled by his continuous duration and therefore return to the battlefield immediately (they were exiled 'until Abdel Adrian leaves the battlefield').
Step 4
Still during the resolution of the same Felidar ability, after exiling Abdel, Felidar returns that card to the battlefield under its owner's control (unless a replacement effect intervened, see the commander note below). Abdel’s return to the battlefield is a fresh ETB event for him, so his ETB ability will trigger again when he re-enters.
Step 5
When Abdel’s new ETB trigger resolves you may exile any number of other nonland permanents you control (which could include some of the permanents that just returned) until Abdel leaves the battlefield, and you create 1/1 Soldier tokens for each permanent exiled by that ability.
Step 6
If any of the permanents Abdel had originally exiled were tokens, those token objects ceased to exist while exiled and do not return — you still already received Soldier tokens for them when they were originally exiled .
Resolution
Typical result when you blink Abdel with Felidar: Felidar’s ability exiles Abdel; Abdel’s “until Abdel leaves the battlefield” restriction ends, so the permanents Abdel had exiled return immediately; then Felidar’s ability returns Abdel to the battlefield, giving you a fresh Abdel ETB (which can exile permanents again and create more 1/1 Soldiers). Tokens exiled by Abdel ceased to exist and won’t return, though Abdel still created Soldier tokens for them when he originally exiled them . If Abdel is your commander and you choose to move it to the command zone instead of exile, Felidar won’t be able to return Abdel from exile, but Abdel still left the battlefield so the permanents he had exiled will return .
