Spirit Link ("Whenever this creature deals damage, you gain that much life.") Before I submitted this proposal I spent some time talking with various R&D folk about how exactly this keyword should work
Its inconvenient for an opponent to remove your cloaked creatures

Aberrant Abomination of Gudul Academy Raider Acquisition Octopus Aerial Extortionist Angler's Shield Anowon, the Ruin Thief Ant-Man, Reformed Rogue Ascendant Spirit Assassin Gauntlet Barbed Servitor Basim Ibn Ishaq Battle Angels of Tyr Bearer of Overwhelming Truths Beast, Erudite Aerialist Belligerent Guest Bello, Bard of the Brambles Bident of Thassa Bilbo, Luckwearer Biorganic Carapace Black Panther, Hope Enduring Black Widow, Deadly Hunter Blitzball Stadium Blurry Beeble Bottomless Pool // Locker Room Bottomless Pool // Locker Room Bred for the Hunt Broodbirth Viper Buster Sword Captain Howler, Sea Scourge Catlike Curiosity Chain Assassination Combat Research Creepy Crawler (playtest) Curiosity Crafter Curious Altisaur Curious Inquiry Curious Obsession Cyclonus, the Saboteur Daring Saboteur Darkblade Agent Deadeye Brawler Deepfathom Skulker Dictation Quillograph Dimir Cutpurse Domesticated Watercourse (playtest) Driven // Despair Driven // Despair Elegy Acolyte Ellivere of the Wild Court Enduring Curiosity Escape Detection Exsanguinator Cavalry Ezio, Blade of Vengeance Faerie Aerie Family's Favor Fathom Feeder Flitterwing Nuisance Frostcliff Siege Garza Zol, Plague Queen Gateway Sneak Gitaxian Mindstinger Glissa Sunslayer Glitch Interpreter Goben, Gene-Splice Savant Goggles of Night Gorbag of Minas Morgul Grazilaxx, Illithid Scholar Haliya, Ascendant Cadet Herd Heirloom Heroes in a Half Shell Hired Heist

One of the most exciting trading card crossovers in years is nearly here
The card art for Belle Accomplished Mystic is absolutely mystifying, but when you add Shift and healing to her gameplay, you get the ability to heal rapidly for a low ink cost, assuming you already have a Belle in play
Psychic - A common psychic trick is to bend a steel spoon with the mind, which is difficult