Thats a really solid ROI, especially when youre up against opponents with a single unkillable creature
I can see Minas Tirith Garrison popping off, especially if youve given all your attackers vigilance with something like Brave the Sands
For the rest I'd recommend more tutors to find Jeskai Ascendancy like Enlightened Tutor and Idyllic Tutor, some good recursion like Underworld Breach, and better mana-fixing like shocks / ABU / fetches
The upcoming Disney Lorcana TCG Gateway will also help to teach many who may be new to the concept of TCGs how to play, especially given how many people may be drawn to the game simply from the familiar Disney characters
There are lots of cube storage options available out there, so I acknowledge this is a bit over my budget and more focused on availability and ease of use for the standard collector which gives us the Ikea KALLAX shelf unit
Then you can give everything from your graveyard haste, to swing faster, as well as from exile casts to Command Zone ones