If you're counting on Winged Sliver or Muscle Sliver or any other boost to carry you through combat, then a removal spell on the key ability can destroy your entire team, and even with Hibernation Sliver available such a blow is often crippling
For example, Game Trail requires you to reveal a Forest or a Mountain, while Fortified Village requires you to reveal a Forest or a Plains
As in, second most expensive card in this ranking
Tevesh Szat, Doom of Fools takes your opponents commanders and Sengir, the Dark Baron takes their life
Trample can deal excess damage to a defending player or planeswalker after all blocking monsters have been assigned damage
Akiri, Fearless Voyager Akiri, Fearless Voyager can provide up to one card draw per opponent, provided you're able to attack each player with an equipped creature