Purphoros, God of the Forge is another damage dealer in this vein, but is far more specific to token based strategies, with Terror able to slot into many more archetypes and provide meaningful removal to boot
Once the Gallifrey Stands trigger goes on the stack, removing that card wont help anymore
The Ninth Doctor Incorporate cards with upkeep triggers for some insane value
Then, during the start of your precombat main phase, you add Black mana to your mana pool equal to the counters on it
This is only just a scratch at to pool of cards that your commander can tutor up for you for just a measly payment of WUBRG
Youll usually use these as tutors for a specific subset of cards, but youll also want the base card to be playable in some situations