How about another one:
Mana Crystal Mine
5 mana, Quick action cost, Conjuration, Target = Zone, Range 0-1, Level 1 Earth
3 Armor, 6 Life
Zone Exclusive, Dissipate 5
When the last Dissipate token is removed, the controlling Mage gains 10 mana.
Once per round, as a full action, a friendly Goblin or Dwarf creature in this zone may remove 1 Dissipate token from Mana Crystal Mine.
Cost is based on Mana Crystal/Flower, Harmonize, Moonglow Amulet, Wispwillow Amulet. You pay 5 now to gain a net +5 mana after waiting 5 turns, less any turns where one of your creatures uses an action (similar to Temple of Asyra or Altar of Skulls). Since it takes a while to earn a profit, it needs to be strong enough to last a little while... although a lucky Force Hammer could take it out. Compare to Mana Crystal or Mana Flower, whose net investment decreases each round, breaking even at 5 rounds and showing a profit beyond that. Gives the Warlord an in-school way to effectively increase channeling, but in his own way (e.g. lump sum payment rather than each round, and with more of an "all or nothing" risk associated with it).
Also, it might make [mwcard=FWC04]Goblin Builder[/mwcard] more useful... second career as a miner!