should i upgrade viego to level 4 or more to beat lissandra

the thing is... he is the worst champion i've play [ I unlocked about 85% of champ ]
I have beat lis 6 times with different champions. pain in the ass but manageable...

But Viego is so different, deck suck and bug can't do anything most of the time .. and with deck that spam board a lot viego can't do sh*t and take agesss to win [ first node of ASOL is fking for him some time i deck out and lose .. ] and also himself is pretty bad when he spam x2 power lvl 2 champions and when he hit mana 10 he and spawn also definitely ... pretty difficult to beat except you get "EXTREME EXTREMELY lucky with power and card item combination.

Ngar Leesin or Yi or big red guy with beard is better than Viego.

I'm not the guy who rant but the this is too much and i have 2 week to beat Lis to get good god ass prize
should I keep trying with 3 star viego and maybe i'll be frustrated and rage quit ..

or should i upgrade [ to 4 or 5 stars it's all suck but overwhelm will help a lot with drag game ] and spend my precious shard for this weak ass champ that i'll never play again after beat the witch queen.

Thank you.