After all the doom-and-gloom predictions I erroneously believed about Universes Beyond warping Standard, it's relieving to see that even I am quite excited to see future sleeper hits for Standard meta within this set in the near future
If you want to play Kefnet in Brawl or just want extra combo pieces, you can also play Riverwise Augur and Karn's Temporal Sundering to set up a similar albeit more expensive version of the loop
Yuffie is a red version of Thieving Skydiver, right
Whenever a creature you control fights, put two +1/+1 counters on it at the beginning of the next end step
It ensures that you are always going to be attacking twice, once you get your board set-up
Usually triggering this powerful ability requires another creature to enter the battlefield, but with Scampire, the creature will trigger its own ability and be able to attack immediately as a 13/13 with haste