One interesting question with GU is how much countermagic you should play
Fierce Invocation, Formless Nurturing, Write Into Being, Cloudform, and Wildcall dig through your deck one card at a time to get you another morph for the field, occasionally with some +1/+1 counters to boot
Theres further merit to using the Angel as an aggressive option, especially when you have either Avacyn, Angel of Hope as your Commander, as it means youre able to build an impressive board of Angels and have this you cant lose the game clause as part of your strategy
Such rare copies don't always reach that lofty height
A few are must-haves for some of the best decks of the set, while others resurrect fan-favorite archetypes from the distant past