While giving each opponent a 1/1 is an annoying price to pay for this, it really isnt a big deal in the grand scheme of things, as youll effectively have access to a one-time boost of 3 mana most of the time
I could go on about why these creatures are good in affinity but with the majority having been constructed staples in the deck I am sure there is more than enough literature out there already on why they are good
Some cards in this set reward you for improving your creatures by referring to "modified" creatures
This one is in 8822 decks, so it's run out there, but not in massive numbers
That's Orim's Chant in a nutshell: good for stopping an opponent in the middle of his combo while he has a bazillion mana floating and damned if he isn't going to take mana burn and die, but don't you just wish it was a cantrip
Essentially, while the red aggro deck's win-rate was only just above 50%, it seemed to be too format-warping in how much it dictated players' sideboarding choices