i like crab umbra + harabaz druid sure its 2 colors and you need 3 other creatures out for the druid
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use 4 highborn they come so handy so much. there are countless times i've won a hopeless battle just because of her life gain or i get a faster win just because my OPP is at 4-6 life and i have 2 highborns on the field so you swing and if they get block you still get the win.
if you keep the white you can add silence, making your OPP not able to play any spells on thier turn
but once its not longer on the stack the converted mana cost is now equal to zero
G24a - If a cost has an "{X}" in it, the value of X must be announced as part of playing the spell or ability. (See Rule 409, "Playing Spells and Activated Abilities.") While the spell or ability is on the stack, the {X} in its mana cost equals the amount announced as part of playing the spell or ability. If a card in any other zone has {X} in its mana cost, the amount is treated as 0. If you're playing a spell that has {X} in its mana cost and an effect lets you play it without paying any cost that includes X, the only legal choice for X is 0. This does not apply to effects that only reduce a cost, even if they reduce it to zero. See Rule 409, "Playing Spells and Activated Abilities." [CompRules 2005/10/01] your right dovescape looks at the cost when its played and once a card with a X in the mana cost is played its new CVM = what the base cost + the new X so if it was a XR and you made X as 6 the new CVM is 7
use more silvers, poison ability stacks so say you have 2 virulent silvers out and the silver that makes them flying creatures and the double striker one. you now have 4 creatures with poison two, double strike and flying that 16 poison counters if all four hit AND YES I'VE DOUBLE CHECK POISON DOES STACK MOST BROKEN ABILITY EVER!
use omnath that way you can store up you excess mana garruk so you can untap two lands a turns and then overrun after a wolfbriar maybe the new elf lord that taps for a G for every elf in play too
id throw in a Mistform wakecaster , he can turn your OPP creatures into silvers and then you can steal them with the overlord. http://gatherer.wizards.com/Pages/Card/Details.aspx?multiverseid=42165
plus the shield from ravenica forget its name but when damage is dealt damage to its redirected to equiped creature
use some stuffy dolls with the hellion, that way you still get hellions affect but not takeing the damage. stuffy doll doesn't prevent but redirects so it works
Vextir
If you looking for a way to drop big things fast always been a fan of elvish piper