With a reasonably low Ink cost of 4 (and no option to use it in your Inkwell, as is the case with several cards on this list!), its easy enough to get Robin Hood into play
Walking Ballista Walking Ballista is one of the best colorless creatures MTG has ever seen, as its just incredibly flexible
Make sure you weigh the cost and consider your goals
And when you do manage to gang up and kill him, it's not like the Commander tax on a 3 mana leader is overly prohibitive to replaying Leo
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That said, both are excellent ways to generate two landfall triggers in Lands decks (Omnath, Locus of Creation)