Creatures you begin to control later in the turn won't gain any abilities or cause creatures to gain new abilities, and the abilities gained won't change even if every creature that normally had the abilities leaves the battlefield
Scrap Welder The fourth card on our list and 26 of 52, the halfway mark is this 3-drop 3/3 Goblin Artificer
As such, if you want lifelink cards, the appropriate theme boosters will help
Creature - Human Spellshaper Color tag templates(None) Bogbrew Witch , : Search your library for a card named Festering Newt or Bubbling Cauldron, put it onto the battlefield tapped, then shuffle
Casting your mind back a few sets, you have Biorganic Carapce, a great draw engine for the deck, from Spider-Man , and The Key to the Vault from Outlaws of Thunder Junction
While Merfolk Secretkeeper and Wall of Lost Thoughts might be a bigger body to cushion blows, their milling ability only triggers once