Autochthon Wurm and Emrakul, the Aeons Torn are the only other two creatures with this high a mana cost, and neither is Pioneer-legal
The important thing, as always, is to remain flexible in your assessments and to position yourself to learn as fast as possible, but learn soft and fast, not hard and fast keep your positions flexible, as even once youve learned something you may find that your understanding was incomplete and you may still need to unlearn it again and learn something else.
Also, I should point out that tying it to strive is a very subtle way to keep token doubling away from noncreature permanents, many of which are much more troublesome with doubling
For example, "Gear Golem the Moving Fortress" and "Guard Mantis" have 2200 and 2400 DEF respectively, and are allowed to have positive effects
It's a piece of equipment with flash that automatically attaches to a creature you control and gives them shroud, meaning that it cannot be targeted by any spell or ability
Infinity Elemental 4RRR Creature Elemental /5 (This creature has INFINITE POWER.) What does infinite power mean
