At time of writing, there are only two known commons that reward this unnamed mechanic: Arena Trickster, which turns from an unexciting Hill Giant into a Rampaging Baloth (and can continue to grow), and Naiad of Hidden Coves, which allows you to play two Vexing Gulls on turn four
The World Tree and Maskwood Nexus combo together to pull all your creatures out of your deck
You can only choose one of them, but each is potentially pretty powerful and useful in different situations
Taii Wakeen, Perfect Shot The draw ability on Taii Wakeen, Perfect Shot is strong, especially with spells like Earthquake that hit multiple creatures, but were here for the second ability
The strength of Oppression comes from how quickly it drains hands, and how it won't affect you since you draw so much