When they enter, you can go and fetch up The Underworld Cookbook from your library, and you can sacrifice two Foods to make a Creature deal six damage to itself
Also, whenever a land enters the battlefield under your control, if its your main phase, theres an additional combat phase after this phase
That is a powerful interaction to be sure, but its more likely that players want additional copies of Unburial Rites before that happens
counter hits "5," that player creates a 5/5 pink Giant Teddy Bear creature token and resets all pop
The other issue is that they require creatures to get the most from them and while you may well pack some creatures in your list you will not have a high enough density of them to be pumping and fighting with them in an efficient way
[+2]: Tezzeret, Master of the Bridge deals X damage to each opponent, where X is the number of artifacts you control