I reckon in a Jaxis, the Troublemaker deck, itd be pretty easy to get to five Rats and with every ETB and attack from the Chitterlord, youre pumping the gnawing lil vermin by +4/+0 from just the one copy
Emergency Eject I debated putting this Edge of Eternities card on the list, but there are two crucial aspects to it that make it a very good card
Additionally, your best payoffs are Blood Artist effects that damage your opponents as your creatures die, which excel at forcing through the last couple points of damage even if your opponents stabilize with blockers
This is especially easy in Oathbreaker when paired with Jace, Wielder of Mysteries so long as both cards stay legal
Also, some decks like the roll dice on demand aspect
Kindred Discovery With multiple ways to trigger a draw based on a called tribe, Kindred Discovery may be just what your blue merfolk, wizard, bird, sphinx, pirate, kraken, etc deck is looking for