When Tolsimir enters, create Voja, Friend to Elves, a legendary 3/3 green and white Wolf creature token.
Whenever a Wolf you control enters, you gain 3 life and that creature fights up to one target creature you don't control.
Tolsimir comes down on turn five and immediately makes Voja, giving you a board presence plus a fight trigger that you can repeat by flickering or recasting Tolsimir. The engine: every Wolf (or Wolf token) that enters fights an opposing creature and gains you 3 life, letting you grind out the board while building a wide Wolf/Elf army to attack and overrun.
Built-in removal on every Wolf ETB that also gains 3 life, controlling the board for free
Comes with a free 3/3 body (Voja) and rewards both Elf and Wolf tribal synergies
Strong defensive lifegain keeps you out of aggro range while you assemble a wide board
Blink and recursion easily abuse the ETB to remake Voja repeatedly
Fight-based removal means your Wolf can die to bigger creatures or deathtouch blockers
Reliant on the commander being on the battlefield for the fight trigger to function
Slow and creature-dependent; vulnerable to board wipes that erase your investment
GW lacks card draw and interaction compared to other color pairs
Voja, Friend to Elves
Tolsimir's token payoff and a separately castable powerhouse that scales with Elves and Wolves you control.