This is the format that everybody usually gets into first thanks to its rotation and consistently smaller card pool than other Constructed formats
If it leaves the graveyard before that point, it will stay in whatever zone it's in, even if it's returned to the graveyard before the ability resolves
Youre pretty much only playing this in bear decks, but its neat how this can attack as a 7/7 whenever Duskana, the Rage Mother is on the field
Watchful Radstag "evolves" when its evolve ability resolves and a +1/+1 counter is put on it
Since he essentially gains +3/+3 each time he takes damage, and gives you three rad counters at the same time, any repeatable ping effect can grow Strong to obscene proportions and Mill your entire deck, opening the doors for a Thassas Oracle win the next turn
In Vintage in particular, you could smash kill folks quickly