The aristocrat strategy is based on the ability to sacrifice creatures, so any creatures that can sacrifice themselves are often more important than any other creatures in your strategy (aside from Blood Artist type effects, but green doesnt have that)
A couple of key options include: Academy Manufactor FEAs , $16 and climbing with plenty of existing EDH demand being expanded upon with the advent of this food deck Boon Reflection , last seen in Double Masters and available near $5 in both foil and non-foil though it could see a reprint in a Secret Lair or Commander Masters this year Rhox Faithmender foils, single printing from 2013, currently near $10 but headed to $20+ if it doesnt catch a reprint Feasting Troll King is a solid threat in this deck if your mana base can support it, and FEAs are single printing, low supply and sitting at about $10
Other tapped creatures you control have hexproof
Counter Intelligence Where World Shaper is a sledgehammer, Counter Intelligence is a finely tuned machine
Or you can shoot just the one, two, or three dorks that you can kill, and then send the rest of it to someone's face
And that combo makes Ral a saucy little Lightning Lad