On top of that, during each of your upkeeps, it distributes +1/+1 counters among your dragons by color, and if you manage to hit all five colors, you just win the game
Options include: Ancient Tomb, Nykthos, Shrine to Nyx, Myriad Landscape, Mana Crypt, Mana Vault, Wayfarer's Bauble, Surveyor's Scope, Coldsteel Heart, Marble Diamond, Pearl Medallion, Knight of the White Orchid, Sol Ring, Thran Dynamo, Worn Powerstone, Burnished Hart, Solemn Simulacrum, Kor Cartographer, Extraplanar Lens, Gauntlet of Power, Caged Sun
When Gruff Triplets enters the battlefield, so long as its not a token, you make two token copies of it
Also: robots are awesome
Creating two extra creatures for 1 mana is pretty good, and even better if youre running token doublers
In the abstract, theres a lot to like