As soon as you have four Sagas in play, old Tom Bombadil becomes a big problem for your opponents to deal with, gaining hexproof and indestructible
For example, take a White aggressive deck built around cheap creatures with tempo-disruption abilities attached like Thalia, Guardian of Thraben, Imposing Sovereign, Containment Priest, and Aven Mindcensor
Guilds of Ravnica Planeswalker Deck: Vraska $39.99 US Shipping Only Due to export restrictions, this item may only be shipped to addresses in the United States, APO/FPO addresses, and Puerto Rico
While more appropriate for the slower midrange builds of this archetype it is so good you play it in any of them
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While this isnt something thats going to be relevant in every game, it comes in very handy against specific decks