Ivern vs Rammus

Place your groves, then go gank while they grow: Friend of the Forest (passive) lets you free the camp without fighting it once the grove is fully grown.

After landing Rootcaller (Q), ping your team: allies who attack the rooted target dash into attack range, and you can dash to the target by recasting.

Cast Triggerseed (E) on the ally who engages: the shield explodes after a moment and slows enemies around them.

Recast Daisy! (R) to give her a target: her 3rd consecutive auto on the same champion knocks every enemy hit into the air.

Stay behind your minions: Powerball (Q) stops on the first enemy it collides with, minions included.

If you deal magic damage, lean on it in trades when Defensive Ball Curl (W) is on cooldown: without it, his resistances drop to those of an ordinary tank.

If you're ranged, don't let him reach melee range when Frenzying Taunt (E) is ready: its range is short, and it forces you to attack him.

Get out of the Soaring Slam (R) area fast: aftershocks repeat the slow there, and if cast during Powerball (Q), it adds a knock-up in the center.

Don't attack during Defensive Ball Curl (W): each auto returns magic damage to you, and he gains armor and magic resist.