Szarekh, the Silent King has proactive positioning, carving the hand and graveyard into a solid board state
For each card exiled this way, for as long as it's exiled, its owner may cast it from exile by paying rather than paying its mana cost
(If you have several Planeswalkers in play, you may activate one ability on each.) Most Planeswalker cards have three loyalty abilities, but some have as few as two or as many as four, so you may have some options on each turn
Howlsquad Heavy A goblin with the start your engines ability that sees play in Standard
Depending on the board, 2 direct damage to each opponent might be better than casting a random Arcane Signet or something
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