While Rainbow Dash is in play, each time you attack with a creature that has flying or haste, you get 20 percent cooler
Apart from mutate cards to trigger that ability, I guess you could use Stuffy Doll and Brash Taunter, or fill your deck with cards that grant abilities to your commander like backgrounds and the legendary familiars (Kediss, Falthis, et al)
NIM DEATHMANTLE Emerging from the high-powered Scars of Mirrodin block, Nim Deathmantle plays with one of the most underutilized kinds of reanimation: the defensive Reanimator card
In the video Inside R&D Magic 2015: Green, Magic developer Sam Stoddard discussed returning mechanics and reprints: Whenever we do a returning a mechanic for a set, we, of course, do want to have a big iconic card that reminds you of why the mechanic is awesome
Sadly, I don't have hyperlink privileges, so you'll just have to suffer with card links
Now there is only one Lotus that is more expensive than the Beta one, right