Another question...

[SPiNx975]

when a card says something along the lines of creatures cost 2 less to cast for blah blah reason and the 2 is colorless... does this mean if the cost includes color it will be covered or that it only accounts for colorless mana in a cost? in other words will the 2 less only count if colorless is in the cost or will it cover even specific colored mana cost?

[Coffee Vampire]

It usually only counts as generic mana. For instance, if you have two {Goblin Electromancer}s out, {Mana Leak} still costs you a blue mana. If the cost is reduced by colored mana, it will tell you, like in {Chord of Calling}.

[Wingnut]

If it shows 2 colorless it is only 2 colorless cheaper.  If it were to cost 1{R}, it would end up costing you {R}

[Wally]

Have a look at the {heartless summoning} deck in articles to see how it works. I've given the natural cost and the adjusted cost for each creature I play.