({4} magic symbol) ({G} magic symbol) ({W} magic symbol) ({W} magic symbol) plus enough mana to pay for commander tax, if applicable, plus ({W} magic symbol) if Glorious Protector was not foretold available.
Steps
Cast Yannik by paying ({2} magic symbol) ({G} magic symbol) ({W} magic symbol) plus commander tax, if applicable.
Yannik enters the battlefield, triggering itself, exiling Felidar Guardian until Yannik leaves the battlefield and triggering the last part of its ability.
Resolve this trigger, putting a +1/+1 counter on any target creature.
Glorious Protector enters the battlefield, triggering itself, exiling Yannik and any number of other non-Angel creatures you control until Glorious Protector leaves the battlefield.
Felidar Guardian returns from exile to the battlefield due to Yannik leaving the battlefield, triggering itself, blinking Glorious Protector.
Yannik returns from exile to the battlefield without using the stack due to Glorious Protector leaving the battlefield.
When Yannik and Glorious Protector enter the battlefield, they each trigger themselves.
Resolve Yannik's trigger, exiling Felidar Guardian until Yannik leaves the battlefield and triggering the last part of its ability.
Resolve this trigger, putting a +1/+1 counter on any target creature.
Resolve the Glorious Protector trigger, exiling Yannik until Glorious Protector leaves the battlefield.
Repeat from step 6.
Results
Infinite +1/+1 counters on all creatures you control besides Yannik, Guardian Protector, and Felidar Guardian.
Infinite blinking of Guardian Protector and non-Angel creatures you control.