Annul Annul is one of my favorite cards of all time
For example, if you cast Junkblade Bruiser (a creature with a mana value of 5 and an ability that triggers whenever you expend 4) by paying its full cost of five mana, you'll already have spent four mana on spells before Junkblade Bruiser enters, and therefore its ability that triggers whenever you expend 4 won't be able to trigger at all that turn
Admittedly hes likely only going to manage to get one batch of Lore before being taken off the field, but when youre only trying to get to twenty points, three can make a big difference
Trample and haste are the prime keyword abilities for this aggro strategy, whether with creatures who have these abilities or the ones who can throw them around your board, like Mina and Denn, Wildborn, Cactusfolk Sureshot and Fires of Yavimaya
(Look at the top card of your library
Turn the grave into a source of card advantage