If possible, try to have as many creatures on the battlefield as possible before Toski enters, that way you can attack and draw cards right away
Consider what kind of game you want to play: do you want to ramp up with powerful green creatures, cast a flurry of spells, or control the board with clever tactics
The slower the deck the more valuable the goblin Man O War is
Other cards that work really well with the angels tribal theme are Bishop of Wings, Rally of Wings, Resplendent Angel if you focus on a lifegain theme, and Harsh Mercy as a "board wipe but not for me"
The non-untapping clause hurts him more in Cube, as you cant always draft a way for him to go off, but I could see him being the second pinger with proper support, like [card]Goblin Bombardment[/card]
Whenever a feline friend falls, he transforms into a planeswalker, boosting your remaining cats and potentially creating another cat ally (with the bonus of throwing around some damage if you have a red permanent)