Captain, The Last Bastion

Partner with Defensive Microbots. (When this creature enters the battlefield, target player may put Defensive Microbots into their hand from their library, then shuffle.)

At the start of your upkeep pay X, give X Drone creatures on the battlefield under your control a Shield counter if it doesn't already have one. (If it would be dealt damage or destroyed, remove the shield counter instead.)

{t}: Reveal the top card of your Library, you may cast Drone Equipment and Creature spells from