(Back in the day, it was the policy to withhold multicolor from sets to make it more exciting for sets with multicolor themes.) Ertai Michael and I created Ertai for two reasons
on the surface, it looks pretty underwhelming, but when you dig in, its actually a very solid value proposition
Also, for an additional cost of one of each mana type, you may untap all attacking creatures, giving them trample, lifelink, and haste until the end of the turn, and trigger another combat phase
One of the reasons this card was banned was that the synergies with Manifold Mouse were too strong: They allow you to target your Heartfire Hero for free to trigger valiant and give it a +1/+1 counter, while you also give the Hero double strike for a turn
Test first