One card is the Commander, and they can be deployed at key moments to boost the abilities of other cards, or for their own impact
9 Grateful Apparition A 1/1 with flying might not be an amazing creature on its own, Grateful Apparitions ability more than makes up for its weaker stats
When it dies or is exiled, return it to the battlefield tapped.) Earthen Ally's first ability can give it at most +5/+0, that is, +1/+0 each for white, blue, black, red, and green
They can include the word mill, put cards into the graveyard, exile cards from your opponents libraries, or similar variations
It's a bit like a task you set to run in the background, and in this case it greatly affects your board with no extra effort
Gandalf the White is a really cool card both from a gameplay perspective and a flavor one