And there's some fairly easy loops to be made meaning you could generate infinite tokens without too much difficulty
Thanks to the sheer efficiency of its mana-fixing, unsurprisingly, Mana Confluence is an incredibly popular card, especially in Commander
Draugr Necromancer allows you to cast spells from among any cards in exile your opponents own with ice counters on them, including cards that were exiled by previous Draugr Necromancers
The latter is mostly due to the lifegain, sure, but getting to bring creatures back even temporarily can be really strong
The more choke cards you stack, the more effective they become, so he's often played with those two cards, as well as Aragorn, Heir to the White City (3R38) , Consorting With Wizards (2R97) , Sting (1R313) , and occasionally Galadriel, Lady of Light (1R45) and Gimli, Dwarf of the Mountain-race (2P121)
You arent giving away your mana base to your opponent when it enters, so thats a good start