Colossal Uprising

When Garruk's Uprising enters the battlefield, if you control a creature with power 6 or greater with trample, draw a card.
At the beginning of your upkeep, if you control a creature with power 6 or greater and trmaple, draw
a card
Whenever a creature with power 6 or greater with trample enters the battlefield under your control, draw a card.

Not enough Dreadmaws (or cowbell)