Relinquished is quite fragile right now in the current meta, with many popular cards being able to deny Relinquished from absorbing the enemy monster, leaving him with zero attack the next turn. This is when Magical Exemplar becomes useful. Only ritual summon Relinquished when the opponent has a monster on the field and you have Magical Exemplar on yours. Using Black Illusion Ritual while Magical Exemplar is on the field gives her two spell counters. When you try to absorb your opponent's monster he would most likely use enemy controller tribute or dimension gate to deny you and leave your Relinquished defenseless. Relinquished would most likely be destroyed in this case unless you have any way to protect him, so use Magical Exemplar to revive him during your next turn by removing only one spell counter. This is because Relinquished is a level one spellcaster which means you can continuously revive him as long as you have spell counters.
Even if you have Magical Exemplar to continuously revive Relinquished, it would still be ideal to not let him get destroyed especially while in attack position because you would still be receiving the equivalent of a direct attack. You would also want to be protecting your Magical Exemplar from getting destroyed.
Sphere Kuriboh can be discarded from your hand to change your opponent's monster to defense position when it attacks. In addition he ca be used as tribute to ritual summon Relinquished even if he is in your graveyard.
All these people shouting "i have x card it'll stop relinq, i have card y so ill just do this". It's still a card game. You can get a absolutely abysmal hand and lose and no matter what cars you thought you had to win, you never draw. Relinquished thrives on having 12 of the 20 cards in the deck being revolved around literally just him with another plus 2 if you want to add Sphere Kuriboh. With restart the odds are even higher that your first hand has either 1 or even 2 relinquished summons. I know there's still newer meta cards that CAN beat relinquished, but it's about consistency, and Relinquished thrives in that aspect. There's just a better chance that you'll take their monster over them having the exact cards to counter. Thats why E-con is so versitile and needed, for decks like Relinquished or (some) 3SD decks.