Blue also has a softer hexproof from spells effect by making opposing removal more expensive to cast
Most creatures with defender struggle with being able to make an impact on the gamestate, but not Thermo-Alchemist
Top Witch-Maw Commanders Atraxa, Praetors' Voice 42,853decks Atraxa, Grand Unifier 17,154decks Thrasios, Triton Hero // Tymna the Weaver 11,102decks Ishai, Ojutai Dragonspeaker // Reyhan, Last of the Abzan 2,196decks Kydele, Chosen of Kruphix // Tymna the Weaver 976decks Ikra Shidiqi, the Usurper // Ishai, Ojutai Dragonspeaker 874decks Ravos, Soultender // Thrasios, Triton Hero 556decks Kydele, Chosen of Kruphix // Ravos, Soultender 504decks Sidar Kondo of Jamuraa // Silas Renn, Seeker Adept 474decks
Double sleeving is especially important for high value or rare cards, for gameplay and storage
Put a landmark counter on this artifact
But do not confuse it with a collection-building strategy