The rank-1 polymorph
The PvP staple: shift for the cheap rank-1 poly, plain press for the full one. Both on one key, and the rank syntax is era-correct classic:
#showtooltip/cast [mod:shift] Polymorph(Rank 1); [harm] Polymorph
The harm gate keeps the bind honest on neutral targets, and the rank-1 fallback line costs almost nothing: classical mages re-poly a broken target, so the cheap rank is the one worth binding.
The focus counterspell
The arena-defining bind: stop whatever you are casting first, then kick the focus target if shift is held, otherwise your current target. Classic-era unit syntax applies:
#showtooltip/stopcasting/cast [mod:shift,target=focus,harm,nodead] Counterspell; [harm] Counterspell; Counterspell
The /stopcasting is what makes the kick land through your own cast in progress. Full notes on the pattern live on thetargeting page.
Frost armor, the fallback bind
The lazy classic standby: shift drops the blizz coat, plain press does whatever the moment needs. The chain is a textbook lazy macro:
#showtooltip/cast [mod:shift] Frost Armor; [combat] Fire Blast; Frost Armor
Shift armors up. In combat, fire blast. Out of combat, armor anyway. One key, three truths, zero thought. The fallback keeps the bind useful every single press.
The blink emergency
Blink is the mage's panic reset, and a clean bind drops the cast and films out in one key:
#showtooltip/cast Blink
Boring on purpose: emergency binds get the least decoration. The mage kit is famously macro-famous because every tool wants a gate: poly gates on the target, counterspell on the focus, armor on combat. That gate-first habit is the wholeconditionals language in class form, and the retail mage page carries the same methods into modern WoW.