This is a huge vanilla creature -- so huge that I think it's actually going to make the cut in most Green decks, even if it doesn't do anything other than attack or block
Its neat that Ratonhnhakton inherently makes the first attack pretty easy to accomplish, having hexproof and unblockability built right in until Ratonhnhakton deals damage for the first time
Pridemate was at like 57 1 1 counters
To get the same protection from the mono-green staples that youd be removing, you can include an enchantment base instead
P/T Number 194 Language English Legal Formats Commander, Legacy, Modern, Pioneer, Vintage Not Legal Formats Alchemy, Brawl, Competitive Brawl, Historic, Pauper, Standard, Timeless Rulings (9/15/2013) If you draw multiple cards, Horizon Chimera's ability will trigger that many times