({9} magic symbol) plus six ({G} magic symbol) at most available.
Steps
At the beginning of your upkeep, Mayael's Aria triggers.
Holding priority, activate Tyvar by paying ({3} magic symbol) ({G} magic symbol) ({G} magic symbol) , giving creatures you control +X/+X until end of turn, where X is the greatest power among creatures you control.
If you do not control a creature with power 19 or greater, repeat from step 2.
Resolve the Mayael's Aria trigger, causing you to put a +1/+1 counter on each creature you control, gain 10 life and win the game.
Notes
The amount of mana depends on the greatest power among creatures you control, and is as follows: 19+ ({0} magic symbol) ; 10+ ({3} magic symbol) ({G} magic symbol) ({G} magic symbol) ; 5+ ({6} magic symbol) ({G} magic symbol) ({G} magic symbol) ({G} magic symbol) ({G} magic symbol) ; otherwise ({9} magic symbol) plus six ({G} magic symbol) .