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If neither of those players cast a creature spell that turn, youll get two Lizards

Or, how about PlaceholderSubType476, probably better known as Changelings in Standard

Discounting activated abilities of of lands you control by 1 is pretty significant and makes cards like Nykthos, Shrine to Nyx (currently ruining lives in Pioneer in a mono-green deck, coincidentally) and Cabal Coffers that much easier to abuse

The Beast's Rush feature also lets him challenge the turn he's played, sealing the deal for just how aggressive this powerful combo can be

As RDW style lists often have to aim some burn at creatures and things it is very useful to have big sources of damage and so Thundermaw is pretty tasty