Two mana is as cheap as they get, but Phantasmal Image balances the cost by tacking on the 'illusion' downside
As an in-print Standard rare, it's unlikely to go too much higher in the near future, but at this point it's pretty clear it was underrated and undervalued during Outlaws of Thunder Junction preview season
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Battle Screech is particularly good, as I can essentially cast it twice for just four mana, and give Livaan +8/+0 in the process
For cards legal in tournaments, Mega Charizard EX from the XY era reached 300 damage
Im most excited to see which creature types get the amass treatment in the future