Switch Sivir's Spell Shield with Morgana's Black Shield. Morgana would still be a heckuva useful character and Sivir would get a buff making her actually usable as a support character again.
There should be a max debuff blocked limit on the shield. So even if you don't do enough (or any) damage to break the shield, reaching the requisite debuffs breaks it as well.
How about we add an actual skill requirement to black shield.
"Duration - 3 seconds, 1 second (Up to 8) added for every negative spell blocked."
As it stands, Morgana's spell shield is ridiculous. It blocks too many effects, skills that don't even do magic damage, and is better than most ults.
It's essentially Olaf's ult that can be used on anyone on your team, in addition to shielding from magic damage. Have fun peeling that Zed off your adc...
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