Adapting your build
Buying against the team you're facing.

« Good medicine depends on the patient! Look at their five at loading, then again every back: healing, physical or magic, and buy the antidote. »
- Read their team
Four deal physical damage, one magic, three heal. You hit one of them: he heals it all back.
- Lots of healing: anti-heal
Anti-heal in your next slot: their healing is cut. What you deal now mostly stays dealt.
- Mostly physical: armor
Four of their five deal physical damage: armor next. Their hits take less off you.
- Mostly magic: magic resist
Another game: four of them deal magic damage. Magic resist instead of armor: same reflex, different answer.
- The classic mistake
Your usual build against three healers: no anti-heal. Everything you deal, they heal back.
When to do it
- Several of them heal or have life steal: get anti-heal (Grievous Wounds) early, it cuts their healing.
- Most of their damage is physical: armor is what keeps you alive.
- Most of their damage is magic: magic resist, then.
How to keep it
- At loading, look at their five champions: who heals, who deals physical damage, who deals magic.
- At every back, look at who hurts you most, and buy against that.
- Keep your core items and adapt the next ones: the build stays yours, the answer fits the game.
The tip for your rank
One reflex at loading: if they have several champions who heal, put an anti-heal item in your build.
Read their damage too: mostly physical, get armor; mostly magic, get magic resist. Check again at every back.
Adapt to what decides the fights: the carry who got ahead, the healer who keeps them alive. One well-chosen item makes their win condition harder.