A common choice is Tormod, the Desecrator, or Desecrated Tomb, which create tokens when a creature leaves the battlefield
That and possibly improving the variables above means that 47 is really the ceiling for how many drafts you need to do, but it may end up being much lower
What really made Seismitoad stand out is the fact that you could lock your opponent down very easily, as early as in your first turn if you drew the Double Colorless Energy
The second ability, where you sacrifice it and create a 10/10 Eldrazi token, is just a bonus
You can also print them onto regular printer paper, and slide them over a bulk common or basic land in a sleeve
Aang, Swift Savior has just been previewed at the time of writing, so we'll see if it can step in where Spell Queller left off