The effect of adding red mana often refunds Jeska's Will's mana cost and then some, especially if an opponent has a ton of cards in their hand because they don't have a hand-size limit
For example, if you control an Omnath, Locus of Creation and make a nonlegendary copy of it with Irenicus's Vile Duplication, you can use regular copy effects on the new token to skirt the legend rule
Examples of active card draw are Friends on the Other Side, Merlin Rabbit, Maleficent Sorceress, Magic Mirror, The Queen Wicked and Vain, Ursula Power Hungry (I mean assuming they have at least one lore...), A Whole New World, Gaston Intellectual Powerhouse, Donald Duck Perfect Gentleman, and even Ariel Spectacular Singer or Be Our Guest
Look at the full Archazias Island card list or see the new Enchanted cards here
If you werent convinced of how good this card is by now, two entries in our list of MTG Aetherdrifts most expensive cards ought to persuade you