mtg defender cards en-Vec - Nemesis where X is its converted mana cost. Best Commander for Defenders. :

Sword of Feast and Famine While there are more effective land untaps, Sword of Feast and Famine is notable as the best colorless land untapper by a pretty wide margin

Being an Intangible Virtue-style lord is a really powerful effect

Delver of Secrets / Insectile Aberration One of the few creatures that regularly sees play in Legacy, Delver of Secrets even has a whole deck named after it

Yorion/Doom Foretold decks are predominantly reactive decks with a few wincons, and it hasnt been quite proactive enough to compete with most of the tier-one decks in Historic

This obviously causes a great deal of issues for your table and can also be built around by including incredibly expensive spells to hit

Then each artifact creature you control gains vigilance, menace, and lifelink until end of turn