An autoattack-reliant carry, so Defensive Ball Curl (W)'s reflect damage lands constantly, and Frenzying Taunt (E) interrupts his relentless combo during Highlander (R), neutralizing Alpha Strike (Q) damage.

He depends on crit autoattacks, but Defensive Ball Curl (W) reflects that crit damage right back, and once caught by Frenzying Taunt (E) he can't land Spinning Slash (E) damage.

An autoattack-based ranged DPS vulnerable to Defensive Ball Curl (W)'s reflect, and Powerball (Q) closes the gap in an instant to lock him down with Frenzying Taunt (E).

He leans on the Three Talon Strike (Q) three-hit combo, so Defensive Ball Curl (W) reflects the damage, while high armor absorbs his spear hits and Frenzying Taunt (E) shuts down the Audacious Charge (E) dash.

An autoattack-enhanced carry, so Defensive Ball Curl (W)'s reflect bites hard, and Frenzying Taunt (E) breaks his Paranoia (R) dive combo, forcing damage loss.

Instead of autoattacks he uses magic/true damage and the max-health-scaling Infected Bonesaw (Q) to ignore armor, and Maximum Dosage (R)'s per-second regen outlasts Defensive Ball Curl (W)'s reflect.

A Thousand Cuts (P)'s max-health magic damage is effective against Rammus's high armor. Hallowed Mist (W) does not stop Defensive Ball Curl (W)'s reflected damage, so Gwen should mix Snip Snip! (Q) and Needlework (R)'s magic damage into the fight instead of relying only on basic attacks.

All his damage is magic so armor is meaningless, and Realm of Death (R) isolates him 1v1 to melt Rammus with sustained damage free of reflect.

Terrify (Q) disables Frenzying Taunt (E) and Powerball (Q), while sustained magic damage and Bountiful Harvest (W)'s drain ignore armor, making Defensive Ball Curl (W)'s reflect useless.

Magic burst and the Pale Cascade (W) shield bypass Rammus's armor, and with little autoattack damage to reflect, the Defensive Ball Curl (W) counter doesn't work.