How close you are to actually winning the game after this infinite depends on the spell involved and whatever secondary benefit it lets you accumulate while endlessly untapping Stella
This is something the community has wanted for a long time, and sacrificing the fight ability to bring the strategy into two colors is a worthwhile trade
At the start of combat on your turn, you can use Tidus to move a counter from a creature you control to a second creature you control maybe an Indestructible counter or a +1/+1 counter
In fact, I would tend to prefer a 3-mana Walker that does this with a +1 over a 5-mana Walker that just draws a card and mills one (Jace, Memory Adept)
Combining two or three of the above cards with Solphim, Mayhem Dominus and a burn spell can very well be enough to end games
The group hug approach plays into this pseudo-gift ability, handing out cards in exchange for doubling up on your spells