Cards like Tenuous Truce and Baird, Steward of Argive keep opponents from swinging at you and the likes of Bloodrot Apothecary (which pings enemies with toxic damage for each token they sacrifice) can literally kill people with kindness
For the fixing lands, the most important thing they can do is provide multiple colors of mana while being untapped as often as possible
The ban of Trafalgar Law from competitive play coincided with OP-08s release, allowing decks like Rob Lucci (strengthened by Jack) and the six new leaders to reshape the meta entirely
Add the Korrina, Arena of Antiquity, and, if possible, the Space-Time Smackdown Lucario entourage, and you can end up doing a ton of damage
He'll take a look at their cards, checking features like the borders, to make sure the image on the card is perfectly centered, and ensuring there are no printing imperfections
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