Stalwart Unity: Commander/EDH should be about having a good time, and this red/green/white/blue deck, with its theme of "Altruism" and Kynais and Tiro of Meletis as its commander, will guarantee that it happens
However, there are likely other more powerful artifacts and creatures available in Magic: The Gathering that offer stronger abilities or synergies that could make Scarecrow Token less desirable in competitive play unless there is a specific theme or synergy that warrants its inclusion
He is always ending the game in two attacks and as such is more in line with Eons Torn in game ending speed
The key is to slay it before it sprouts so many heads that your fear outpaces your greed
Double strike and trample is brutal enough, but then you take into consideration that it can be cast for as cheap as and attaches itself immediately to one of those unblocked attacking creatures
Cards that can remove any potential threat, for this reason, are quite valuable