Whenever a creature attacks you, make a Clue artifact token, which can be sacrificed alongside paying two mana to draw a card
Remember, to make this it must have a White color identity, not multi like Dismantling Blow and then cannot be a cantrip like Shelter or Wall of Omens that replaces itself when doing something else but an actual proper card draw spell
Now, this seems to be all the more problematic for the health of the game considering the ridiculous prices that the MTG x Final Fantasy products are going for
The madness cards in the deck also work pretty well with Chainer, but they become just the fuel to feed the fires of getting cool creatures onto the battlefield with hasteeven if youre not casting them
Able to grab the best card for any situation from your sideboard, if you have a Karn on the field, you're prepared for anything