[The Good Idea] VS [The Bad Idea]

[The Good Idea]:

Parry Casting an ability or attacking a enemy champion grants 8-30 (based on level) bonus Armor and Magic resistance and increase your total Armor and Magic resistance by 12% for 1 second. The cooldown of this rune is cut by half if you take enemy champion damage during it's duration. Cooldown: 8 seconds (starts when the effect ends)

,

Momentum's Strength Moving towards enemy champions increase your Armor and Magic Resist by 1-4 (based on level) and increase your total Armor and Magic resistance by 1.2% for 3 seconds. This effect stacks up to 5 times for a maximum of 5-20 + 6% bonus Armor and Magic resistance and decays after 3 seconds without moving towards enemy champions.

,

Fearless Grants 10% + 6-27 (based on level) bonus armor and magic resistance for 2 seconds when damaged by an enemy champion. Cooldown: 12 seconds (starts when the effect ends)

Etc.

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[The Bad Idea]:

Iron skin/Magic Shell:

3 armor or mr