Although these three are somewhat fair cards, WotC learned a lesson the hard way of not printing card draw in delve spells like Treasure Cruise, since those are really problematic
Unfortunately, the cards in this precon don't support the kind of deck manipulation needed to really get the most out of it and, where the likes of Brainstorm make for perfect setup, it only really has a handful of similar instants
This costs 5 mana, plus 3 for the activation, but you can pretty easily go and find something from your deck
Whenever another legendary Elf you control enters, draw two cards, then discard a card
To summarise the combo: Cast Threefold Thunderhulk, which makes you three gnome tokens Copy it with Saheeli, Radiant Creator, which makes 8 more gnomes tokens As the copy of Threefold Thunderhulk's base power and toughness is now 5/5 and enters with three additional +1/+1 counters Attack with Threefold Thunderhulk and make another 8 gnome tokens You would be left with the original Threefold Thunderhulk as a 3/3 and nineteen 1/1 gnome tokens There is a little bonus to the Threefold Thunderhulk, as it has one more ability