Kardur, Doomscourge - Goad is a fun and powerful mechanic, and while its not specifically called that on the card, thats what this guy does to all your opponents creatures on ETB
This can give you some wild turns, so long as you have the mana to cast the extra cards that Syr Carah will draw for you
If a blocker is in play, Kaido effectively shuts it down, letting us attack the opponents Leader without worrying about our attack being blocked
You should be able to see the light shining through the other side of the card if its powerful enough
Theres a high likelihood your first drawalong with a Pok Ball or Professors Researchcan get you up and running immediately
At the start of each player's upkeep, you get to make a 1/1 Saproling creature token