The card cast from Lurrus isn't exiled, so as long as it doesn't get removed from the graveyard through other means, you can always recast any spell you play with Lurrus on your next turn
Tangle Wire is an immensely polar card being a dead draw in the late game and often a Time Stretch against the right sort of deck in the early game
Clams and oysters are, admittedly, in the same taxonomic class of bivalves, but so are you, dear human reader, and a raccoon
Here are the decklists for the Starter Commander Decks
In a Zombie tribal deck, for example, the player can cast Frantic Search to draw new cards, then discard two Zombie creature cards that they intend to reanimate later
Gaius van Baelsar Gaius is just very expensive for what he offers, as you are often getting significantly better than this for 4 mana in constructed, but he will be welcome in limited