Cards like Hired Claw and Razorkin Needlehead can easily burn your opponent to deal extra damage through basic game actions
And bouncing has a lot of flexibility as a way to survive removal or blocks, adding a useful tempo element, reloading a creature with a powerful enters-the-battlefield trigger, dealing with auras and so much more
Eladamris Call In what may be the most basic non-permanent creature tutor, Eladamri's Call functions as a Demonic Tutor for creatures only, in that its a 2-mana spell to fetch something specific from your library
This is not the most difficult thing to do because Professional Face-Breaker has some evasion (Menace), or you can simply get other creatures to do the job
This wont solve every problematic board state, but it does a lot of heavy lifting for 4 mana, and doesnt require any setup to be a very good inclusion in most Commander decks