With a cardpool stretching across fifteen-and-a-half years, the bar for entry is high, and theres a reasonable fear that a card strong enough for Modern has the potential to warp Standard around its existence
If you are winning, you are not in an alliance
Other Partner pairings, like Rograkh, Son of Rohgahh and Silas Renn, Seeker Adept, consistently put up strong results at competitive events
Faeburrow Elder is a Treefolk Druid with a similar ability, and it gets +1/+1 for each color among other friendly permanents
Self-Destruct, for example, would have been a nastier component of the already rampant Mono Red, especially with the knowledge that one of the winning moves for it was to blow up a Heartfire Hero using it