Find Familiar + anything requiring a spell attack e.g. Fire Bolt, Ray of Frost and Witch Bolt.
How? Summon an owl as your familiar. It can't attack but it can use the Help action. Order it to fly in, Help and fly out. Its movement away doesn't provoke because it has Flyby. Ready your spell for when your owl Helps and you'll get advantage. Best of all, you can do it every round.
Why do you need to ready your spell for this? On its turn, your familiar distracts the target (help action to help you with an attack), then you attack it on your turn with advantage. The help action says "If your ally attacks the target before your next turn, the first attack roll is made with advantage."
Enlarge/Reduce (used to reduce an enemy), then web.
If you cast spike growth, you can then maintain concentration while wild shaping into a bear, Grapple (bear hug), and drag or shove the foe across the spiky terrain..
We had two casters, but good point. I'd forgotten about that.Both of these are concentration spells IIRC, so you'd need two casters.
Interesting -- I hadn't read it that way at all. I thought of it as: the familiar zips in and jabs at the monster's head to distract it, then zips away. A second later when the Fire Bolt comes in, the creature is blindsided because it's still watching the familiar to make sure it doesn't come back and poke its eyes out.The rules imply very strongly that the helper has to be within 5' of the opponent at the time the attack is made. It's a very soft DM who allows the effects of help to linger after the helper has moved more than 5' away.
That's one I wasn't sure about. The help action is described as helping a specific creature with a task or attack, i.e. the familiar is helping the caster make an attack, and the caster ("your ally" vs. "a creature") is the one who can get advantage on an attack. However, the fluff description of feinting or distracting the creature implies that anyone attacking that creature could get the benefit, not just the creature you're helping. One way to think about it would be that the familiar is drawing the monster's attention specifically away from the caster or timing a feint knowing when the caster is planning to attack. I could see it being ruled either way, but it doesn't particularly make the tactic less effective if someone else in the party gets the benefit.The second consideration is that without readying, the familiar may help one of the wizard's allies rather than the wizard himself depending on the initiative order.
And you'd take damage too. That doesn't seem so smart.