If you discard a card with madness to pay the cost of a spell or activated ability, that card's madness triggered ability will resolve before the spell or ability the discard paid for
However, this strategy relies heavily on luck, and the high energy cost of Dragonite's Draco Meteor attack can leave you in an awkward position if it gets knocked out
While there may be better cards with similar effects, Jund is a Plane can still be a valuable addition to a deck that aims to overwhelm opponents with powerful creatures and goblin tokens
Repudiate / Replicate One of the good things about split cards is allowing the user to play narrow effects, and fewer cards are narrower than Stifle (Repudiate)
In fairness to the LLM, its genuinely hard to create a list which is simultaneously balanced by both color and rarity
Is there anything else you want to know about summoning sickness