mtg serra card Serra's Guardian You get an emblem with If you control a creature Serra Angel - 147 -

But what other features can you rely on

Even outside of that use-case, Springheart Nantuko is a fantastic creature that can generate absurd amounts of value regardless of what you may or may not bestow it upon

These can then be used as materials to create an Xyz monster of that rank (i.e., two level four monsters can be overlaid to create a rank four Xyz)

One of the easiest ways to dive into the format is through MTG Arena

The MTG Tournament states, "Proxy cards are illegal in tournaments

Threats Undetected The green version of Gifts Ungiven, Threats Undetected is a guaranteed two creatures to your hand out of the four you present to your opponent