they effectively only cost 1 mana since they recoup half the cost instantly
All-Seeing Arbiter Anje Falkenrath Bag of Holding Bone Miser Brallin, Skyshark Rider Cam and Farrik, Havoc Duo Captain Howler, Sea Scourge Conspiracy Theorist Containment Construct Containment Construct Cool but Rude Cryptcaller Chariot Currency Converter Diviner of Fates Doctor Doom, King of Latveria Dying to Serve Feast of Sanity Glint-Horn Buccaneer Green Goblin, Nemesis Hashaton, Scarab's Fist Hobgoblin, Mantled Marauder Inti, Seneschal of the Sun Ivora, Insatiable Heir Lady Spider, Maybelle Reilly Lazotep Chancellor Magmakin Artillerist Marauding Mako Mary Read and Anne Bonny Midnight Oil Mishra, Excavation Prodigy Monument to Endurance Moonstone, Harsh Mistress Mystic Redaction Necropotence Oskar, Rubbish Reclaimer Pitchstone Wall Pyre of the World Tree Rielle, the Everwise Scrounging Skyray Shipwreck Sifters Spider-Man, New Champion Surly Badgersaur Toluz, Clever Conductor Urza, Powerstone Prodigy Veronica, Dissident Scribe Wharf Infiltrator
Reanimation is also a good call considering that the creatures enter the battlefield from the graveyard
With rare cards selling for thousands, and even hundreds of thousands, of dollars, its no wonder collectors and fans alike are eager to know the value of their collections
If a creature enchanted with an Aura that has umbra armor would be destroyed by multiple state-based actions at the same time (most likely because a creature with deathtouch has dealt damage to that creature greater than or equal to its toughness), umbra armor's effect will replace all of them and save the creature
