You can untap it by putting a -1/-1 counter on it, so pair it with something that offsets the counters or turns it into a non-creature, and youve got infinite green mana
Weaknesses Might and Magic is a nice showcase of the expansion's big new mechanics, but its pool of technical options is pretty limited
Another roster of brands I could see doing well with trading cards would be HIT Entertainments portfolio, now under Mattels ownership
Meanwhile the Mardu deck that players are running - shared on Twitter by user SoIMBAGallade - has a load of different MH3 cards in it
Forests Matter Fangorns nickname is Treebeard, and he and his kinfolk get riled up by Sarumans savaging of the wilderness for raw materials, so adding some Forests matter cards seems quite on-theme
however, the Angels chosen feel very lackluster to me