Thanks to all of these, and countless other tiny interactions, Rograkh is a bit of a staple in cEDH
Lorwyn was a typal set that cared about eight species creature types: Elemental, Elf, Faerie, Giant, Goblin, Kithkin, Merfolk, and Treefolk
Partner as an ability was a bit problematic, opening up the Commander format a little too much, and becoming more and more powerful the more cards that are printed with it
A-Cauldron Familiar can't block
Mana is the fundamental resource of Magic and if you can accelerate, it is normally correct to do so
There are also some exclusive cards for specific Secret Lairs, like the Dungeons & Dragons cartoon version of Crash Through or the word-vomit full-text Terramorphic Expanse