Protective spells can be lumped into two broad categories: spells that protect a single creature or permanent (Tamiyo's Safekeeping, Slip Out the Back) and cards that protect your entire board (Teferi's Protection, Heroic Intervention)
His Strength is only 3, but because of his "Support" ability, players can add his 3 Strength to another character while he is questing
Its a great built-in value engine and works incredibly well in discard decks, earning itself the infamous Game Changer status
However, the last part of the ability will check how much life you've gained as the ability resolves, so if you've only gained 5 life this turn by the time the end step comes around, you could still gain 2 more life while this ability is on the stack in order to return the target creature card to the battlefield instead of your hand
Unless people are slinging a lot of damage around, it won't be unusual for us to have over 50 life