Laelia's last triggered ability doesn't care which player is exiling cards from the library or graveyard
Well, at least one fan vehemently disagreed
Arcane Signet was made to be perfect for Commander and is an uncontested best-in-slot, though this applies to all colors
Example Decklist: Grixis Shadow | Modern | _Logic_, 5-0 MTGO League Creatures (14) 2 Grim Lavamancer 2 Scourge of the Skyclaves 2 Snapcaster Mage 4 Death's Shadow 4 Sprite Dragon Instants (14) 2 Drown in the Loch 2 Temur Battle Rage 3 Lightning Bolt 3 Stubborn Denial 4 Fatal Push Sorceries (9) 1 Unearth 2 Expressive Iteration 2 Inquisition of Kozilek 4 Thoughtseize Artifacts (4) 4 Mishra's Bauble Lands (19) 1 Island 1 Mountain 1 Swamp 1 Fiery Islet 1 Steam Vents 2 Blood Crypt 2 Scalding Tarn 2 Watery Grave 4 Bloodstained Mire 4 Polluted Delta 3
Company: Pokemon USA Series: Evolutions Item Type: Single Card Release Date: November 2, 2016 Brand: Pokemon UPC: 643690291466 Stock #: 145738 Our Guarantees to You, Our Valued Customer
This isn't just a cool visual, but the card's mechanics also perfectly capture this moment from the game