Calgar being able to take tokens of all sorts and turn them into cards, or turn surplus mana back into more Space Marines is pretty decent at translating his acumen for eking all available advantage into victory
You can use cards similarly to Ink in order to Boost their power, letting them regain their abilities
The first ability costs three mana and turns a permanent into an Artifact, which is fun, but often not great on its own
Protection Lastly, we have protection
Ideal for casual and competitive play, they make a fantastic addition to any Magic collection.
Even if opponents stop attacking you for a while, you can still swing at them for aerial damage and take advantage of the fact that they have no flying creatures, if applicable