Hitting any permanent with mana value 4 or less removes a significant portion of threats
An Amber type Floodborn character, Vanellope normally costs 4 Ink to play, but using Shift, shell only cost 2
This white creature is amazingly annoying (and you know that's enough for some players!), and with any sort of blink this bird rogue becomes a serious control tool: Plotting a card from the stack can deal with uncounterable spells, and any counterspell you plot becomes effectively useless (since they don't work at sorcery speed!)
It turns all of your noncreature tokens into land creatures, letting them tap for mana
The community features (discussions, social elements) are poorly organized
By including as many of these cards in my cube as possible I would find that the games that were being played were improving