Recoil(with many shout outs to Dismantling Blow, Orim's Thunder, Absorb, Undermine, Aura Mutation, Artifact Mutation, Aether Mutation, Jilt, Agonizing Demise, Probe, and Many More): In some very real ways, this Block was the first time that we had common effects twinned to bonuses such as card drawing, token making, discarding, and more
This is a big deal in longer games for archetypes like Mono-White that have difficulty coming across card advantage that doesnt have some sort of lousy drawback
This is amazing in +1/+1 counter brews since you can get increases, and then move counters here for more Fogs with Spikes, or for things like Experiment Kraj in your Simic +1/+1 Commander brew
The advice for buying and selling singles, then, stays the same as always