Similarly, Kellan, Planar Trailblazer also allows you to play more cards when it deals damage to players, though it requires a bit more investment to achieve this
My cube has some other design guidelines that might pollute the purity of my experience and notable among those are - Artificial powerlevel/balance, because not all tribes are created equal so I am very wary of just putting in some of the most powerful cards in tribes
For example, if an effect has given a 5/5 creature -7/-0 so that its a -2/5 creature, doubling its power makes it a -4/5 creature
Enchantment Color tag templates(None) Zendikar's Roil Landfall Whenever a land you control enters, create a 2/2 green Elemental creature token
Even if I think this 4-mana sorcery speed spell isnt great, I cant let it go, and I feel it should be at least mentioned here