For example, if you cast Roamer's Routine from your graveyard and also tap a creature you control with power 3, you'll pay only The cost reduction applies only to the generic mana in the cost, so even if you tapped a creature with power 15, you'd still pay Omens With dragonstorms on seemingly every horizon, ill omens are ubiquitous these days
Arcums Weathervane and Arcums Sleigh made use of Snow-covered Lands while Arcums Whistle allowed you to have a Norritt that destroyed the target creature at end of turn, unless the casting cost was paid
For those who want to crash through combat: Caesar, Legion's Emperor, Jetmir, Nexus of Revels, and Ghired, Conclave Exile are terrifying options
Naveen needs to be dealt with, but by the time hes on the board most of the damage is already done
Unfortunately, to get all this card draw, you do have to pay for it each turn
The Earth Crystal BPhillipYork: Well counter doubling can be good, and it really has lots of support for counters, the doubling, and then the ability to distribute them, which inherently gets doubled