The choice of creature type is made as Kindred Discovery enters the battlefield
There is no need to say more, and you will see just how powerful this is by looking at the cards it can remove: Kroxa, Titan of Death's Hunger Valki, God of Lies The Ozolith Scourge of the Skyclaves Shadowspear Thassa's Oracle Steelbane Hydra Fiend Artisan Tome of Legends Underworld Breach Robber of the Rich and many, many others
The deal is to get Kiki-Jiki, Mirror Breaker on top of your deck somehow, usually through a tutor (we'll get to those shortly), and then use Snoop to copy itself at the end of your opponent's turn
Menace is a newer kind of evasion and I dont think we're giving it enough credit yet
So, how does a random old card (with a bunch of reprintings that are worth $1 or so) end up spiking to $300
Brawl Legal Vintage Legal Timeless Legal Commander Legal Pauper Not Legal Oathbreaker Legal Penny Not Legal Toolbox Notes and Rules Information for Aerith, Last Ancient: Aerith's last ability checks at the moment it would trigger to see if you gained life this turn