Starting intensity 0
When Teysa enters the battlefield, create a 1/1 white and black Spirit creature token with
flying (This creature can't be blocked except by creatures with flying or reach.). Teysa intensifies by 1.
Spirits you control get +X/+0, where X is Teysa's intensity. At the beginning of your end step, you may exile Teysa. If you do, at the beginning of your next upkeep, return Teysa to the battlefield under its owner's control and it gains
haste (This creature can attack, and as soon as it comes under your control.).