Cataclysmic Gearhulk does a pretty respectable sweeper impression, but with the added bonus of being a victory condition and being a legal target for Liliana to get back
destroy Spell/Trap Card(s) your opponent controls, up to the number of "Spellbook" Spell Cards in your Graveyard
Tournament Policy is often overlooked as Duelists focus on card text and rulings, but its every bit as important a part of tournament preparedness
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Card advantage is a strategic concept (rather than a specific game term) and a lot broader, and basically means having more cardboard than my opponents. For starters, any card that puts more cards in your hand is card advantage, even if it doesn't say draw. But card advantage also looks at what happens in other zones
Knight does the same to any enchantments or artifacts as well as gaining you a bit of life against mono-red and mono-white, but the most important tool is Frilled Mystic