Reanimator in Boros is possible, sure, but doing it without a synergy piece in the Command Zone is hard , and not a way Id advise to build your deck in 2026
Many collectors prefer double-sleeving because it creates an extra layer of security around valuable cards

Synthoids Abandoned Sarcophagus Abzan Banner Abzan Monument Academy Manufactor Accessories to Murder Accomplished Automaton Accorder's Shield Ace's Baseball Bat Acidic Dagger Acorn Catapult Acquisition Octopus Adaptive Automaton Adaptive Gemguard Adaptive Omnitool Adaptive Training Post Adarkar Sentinel Adrestia Adventurer's Airship Adventuring Gear Aegis Automaton Aegis of the Legion Aegis of the Meek Aeolipile Aeon Engine Aerial Doombot Aerial Surveyor Aerial Toastmaster Aeronaut's Wings Aesthir Glider Aether Refinery Aether Spellbomb Aether Syphon Aether Vial Aetherflux Conduit Aetherflux Reservoir Aetheric Amplifier Aetherjacket Aethersphere Harvester Aetherwing, Golden-Scale Flagship Aetherworks Marvel Aettir and Priwen Agatha's Soul Cauldron Agent of Acquisitions Agent's Toolkit Agility Bobblehead Air Response Unit Akroan Horse Akroma's Memorial Al-abara's Carpet Alacrian Armory Aladdin's Lamp Aladdin's Ring Alchemax Slayer-Bots Alchemist's Vial Alchor's Tomb Alhammarret's Archive Alibou, Ancient Witness Alibou, Ancient Witness Aligned Hedron Network All-Fates Scroll Alloy Golem Alloy Myr Alpha Myr Altar Golem Altar of Bhaal Altar of Dementia Altar of Shadows Altar of the Brood Altar of the Goyf

MPL pros threw a straightforward Omnath shell together on day one of Zendikar Rising, and that list proceeded to run roughshod over tournaments with very little refinement until it was eventually banned
You can go deeper on the +1/+1 counter synergies, you can try to find some more interesting, niche explore creatures, or you can dig into The Lost Caverns of Ixalan for more synergistic merfolk