mtg lesson cards Airbending up to two target creatures you control each gain Whenever this creature deals combat damage to a player What is the purpose of

The Best Mythic Soldier Tutoring up your Esper Sentinel is always the right play, and Ranger-Captain of Eos is going to let you do that AND has a sacrifice ability, making it so your opponents can't cast non creature spells

Rubinia has the ability to tap to steal a creature your opponent controls, letting you hang on to it for as long as you control Rubinia and she stays tapped

Because you can get cards that have defender without being Walls, the two are not synonymous

So far we have, as you can see above, The Sword of Wealth and Power and the Nexus of Becoming cards, in a variety of different card treatments including cards with Vault Frame artwork