Pit Scorpion is an example of a card from this set that cared about Poison Counters
This white creature is amazingly annoying (and you know that's enough for some players!), and with any sort of blink this bird rogue becomes a serious control tool: Plotting a card from the stack can deal with uncounterable spells, and any counterspell you plot becomes effectively useless (since they don't work at sorcery speed!)
Magda, Brazen Outlaw Magda, Brazen Outlaw provides the whole package: token generation (the second ability applies to Magda, so it'll create a Treasure when it taps to attack) and a sacrifice outlet for said tokens
Waste Not is our chief payoff for when our opponent discards cards, but were also playing Dauthi Voidwalker
Champion of Lambholt makes it so that your creatures are extra hard to block as long as it has a pile of +1/+1 counters
Which colors are performing the best