I've faced a double-Forge Anvil Throne Warlord. He generally only deployed from 1 Forge each round, though, because it's so mana-intensive... which means he'd might as well play 1 Forge and a Mana Flower instead... but at least it prevents the opposing Mage from taking out his lone action generator (because redundancy).
For 2 Forges, you're paying 16 mana for the Forges on turn 1, so you only have 12+2 mana going into round 2 (assuming channeling 9), and if you're a Dwarf Warlord, you're paying for Runes on most of your equipment, too. It's hard to get 2 equipment out each round unless they all cost < 5 to cast, on average. Often this goes with Cheetah Speed so you can double-move (if necessary) + attack each round, often QC'ing FD enchantments on self (and occasionally revealing them), since you don't have much mana for anything else. This means you rarely have mana for other spells, like Tanglevine or whatever.
In comparison, you could do something similar with 1 Forge and QC a second equipment on yourself each round and be geared up just as fast but saving 8 mana on turn 1 (with double-move + Forge), and maybe keeping a second Forge in your book as back-up in case the first gets destroyed (e.g. by double-Swell).
