Ratadrabiks supposed to circumvent some combos by creating non-legendary copies of legends that die, but Boromir, Warden of the Tower works around this
Doomed Traveler is a very concise example: a cheap and unremarkable creature with a death trigger that makes it a prime sacrifice target
Shoutout to Brotherhoods End, too if for whatever reason youre not big on rocks or small creatures, this one can pull a lot of weight, too
Despite Grixis Shadow being currently maybe the strongest deck in the format (thanks to Lurrus obviously) I think Deaths Shadow is not the correct way how you want to approach your tempo deck in the future
Reflector Mage being a Wizard pointed me towards that tribe, but the payoffs arent there
As you have control over what stays in your hand, you can cherry-pick the specific cards getting discarded