Heres an example of a trusty WU deck I used to play in Standard with some lessons added
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With an easy way to grab a Supporter (Scott, Castaway) and assuming you will not have your hand thrown out by next turn, this can be a fantastic recovery card that adds plus 40 damage to your attack when behind on prizes
Recurring Nightmare and Survival of the Fittest This Standard-era deck worked powerfully by using Survival of the Fittest on the 2nd turn to start trading creatures for perfect fits, filling up the graveyard
Sliver decks are based around each card granting incremental bonuses or individual keywords until you have an army of creatures with haste, +1/+1, vigilance, poisonous, trample, reach, and more