Of the three full Tyranid Genestealer cards, I think they do a nice job of capturing that element
Because she gets the trigger at the end of the turn, rather than during your upkeep, she cannot be answered on other turns, or give folks a full round of answers
Similar to how Ariel can deal damage without challenging, Tinker can too as soon as you play her, causing one damage to each of the opponent's characters
Training is a new ability introduced in Innistrad: Crimson Vow that allows you to put a +1/+1 counter on the creature whenever it attacks with a creature that has a higher power than it
Aura-voltron is a legitimate, cheap way into the archetype just respect the two-for-one math
5 feels too expensive really for what it does