All variations of trilands Ive ever seen have been format staples during their lifespan, but the format being 3 years instead of 2 expands the options for multi-colored lands so widely and creates so many options for aggressive strategies that drawing a land that enters tapped can be a hindrance
Gideon's Lawkeeper represents the most efficient form as a 1-mana creature whose ability only costs 1 mana, but even more expensive versions are effective disruptive pieces
Play it early to remove a mana dork or critical creature
That means if someone casts a ten-mana spell, they are going to be milling ten cards on their next untap step
Also, the lifegain hardly ever matters in a format like Commander, making it largely null in most cases, especially when small utility creatures are targeted
Doc Aurlock, Grizzled Genius I love Doc Aurlock, Grizzled Genius from Outlaws of Thunder Junction , though the bear is relatively new among Magic cards