Charizard Cards: Always a fan favorite, any rare or full-art Charizard card tends to be popular
The poster cub for main-phase utility here is Duskwatch Recruiter, who has carved out a storied career every from Standard, to Pioneer, to Modern, to Cube, to Legacy
There is enough overlap between soldiers and humans, so aside from decks that focus on non-human soldiers like kor, kithkin and cats, the Coppercoat is a good addition
The Commander is the legendary creature that leads your other 99 cards into battle in games of EDH: they dictate the colors you can include in your deck, and shape your overall strategy
It's sunburst as a four-drop makes it a great early card and 4/4 dork
Other options include artifacts to sacrifice, like Eggs and Braids, Cabal Minion