If all targets for the chosen modes become illegal before the ability resolves, the ability won't resolve and none of its effects will happen
Having some sort of removal in your deck in Standard is almost mandatory and Unsummon was just too temporary
When people sub vintage at lower tiers, I think graders see so many very very clean modern stuff that when vintage comes along they give 8s for a tiny print line (when back in the day when it would be given a 10 grade)
I kind of like stuff like Ancient Craving and Damnable Pact in decks that get a lot of mana
Various other rules throughout the document have also been updated to accommodate battles, including rules for combat, counters, types, state-based actions, and so on
Drawing too many Chords can leave you unable to make plays in some spots anyway