In decks that utilize unblockable creatures (or anything that deploys cards like Rogues Passage or Assassins Regalia), Shredders Technique could be considered an auto-add due to its ability to remove pesky value engines for a single black mana
Many of the decks we play on Budget Magic are close enough to $12 on Magic Online that you can switch up a couple of cards and get them for free
Due to the amount of play it is currently seeing, Counterspell is rightfully among the top 3 best blue card in Modern
On its face, its just a big flying threat, but morphing it into play and flipping it up when your opponent least expects it lets you tutor up whatever dragon you need
Opponents become more selective about killing your guys
(Note that the Path just swaps back creatures, so if you stole an artifact or enchantment or Walker, thatll stick with you)