There are several general options:
1. Queue up multiple cards to play at a time so you may discard and draw. Golem is the classic, throned (Kc, etc.), throned Vassals are another, turn start plays (e.g. some combination of wonky stuff like multiple Summons or Prince-of-draw), throned Overlords/Band-of-Misfits with a cost reduction token, throned Inspiring draw cards ... basically any setup that allows for the play of Tac with another drawing card banked can work.
2. Discard something that allows for draw-on-discards like Trail, Weaver with appropriate Ways, or Village Green.
3. Playing the Tacs (and other cards) from a place other than your hand. For instance. if you have top-decking/Gamble you can stack your deck top with something like Pawn, copper, Tac, Pawn, copper, Tac. Other setups include complicated stuff like Innovation (e.g. I think buying a Trail should work that you can then use an Innovative Tactician to play, if not I know you can Villa/Tac).
4. Throne Tac with some modifier that allows for drawing after discarding. For example Rc/Way of the Owl allows you to play half of your Rc +1 for discarding multiple Tac plays. Similarly you can get a lot of mileage out of using a +1 card token on Tac.
5. Muck with phase changes. For example, Launch can let you draw something like a Wt to get a second play out. Cavalry can let you draw and play after the first Tac.
6. First Mate, as noted, is all but trivial.
End of the day we know have a lot of ways to draw after discarding everything. Most are too convoluted to see or even use when you see them. But if it is the only way on the board to draw bigger hands it can be exceedingly powerful (e.g. with Banks, HoPs, Priests, or other options to cash out on a megaturn).