Higher-rarity cards tend to be splashier, more complex, or more powerful because Wizards uses rarity to help manage Limited formats and card complexity
I gotta say, it's impressive what Wizards of the Coast will do to stretch TarmogoyfTarmogoyf a bit more
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If flipped, it wipes off every monster, then forces players to excavate cards until they get as many monsters as were shuffled in each Main Deck
Good spells to use are: archetype support cards, searchers like Reinforcement of the Army or Preparation of Rites, monster destruction like Raigeki or Dark Hole, monster protection like Forbidden Lance, spell/trap destruction like Mystical Space Typhoon, and deck thinners like Upstart Goblin and Pot of Duality
2 Add: Guardian Project Cut: Staff Of Compleation Kind of a more generic upgrade to include, but one that guarantees sustained card draw turn after turn is the Guardian Project