Players can cast spells and activate abilities after the triggered ability resolves but before the spell that caused it to trigger does
Simply put, your opponent has to kill this creature or they have virtually no chance of winning, which is the simplest definition of a 10/10 card
Astrologian's Planisphere This two-cost Blue artifact Equipment with job select Equip for 2 will make it a Wizard and then as you cast non-dorks, toss a +1/+1 counter here and then on your third card drawn each turn, not just yours - brilliant win con there for Spellslinger brews and Commanders for Commander Damage in Cantrips
Tutoring for an Equipment when it enters is ripe for abuse with blink and flicker effects, and then doubling the effects of Equipment could easily bring the game to a close before it even started
You're Excused allows you to look at the top card of your deck after you quest and determine if you want it to stay there or if you want to move it to the bottom of your deck
And you can keep him safe by just not questing with him while you deal with whatever threats are on the board
