Finally, Jaces 0 loyalty ability provides a steady stream of card advantage that keeps his controller in the game
If the effect doesn't specify a player, the object's controller puts those counters on it
You can play these cards in all manner of formats, but particularly Modern and Commander, which are the two most popular
Land/Mana Ramp All Commander decks run some level of mana ramp and it almost always starts with Sol Ring, and green decks will also tap into two-mana land ramp cards, like Natures Lore, which helps you cast Minsc & Boo, Timeless Heroes a turn earlier, which hopefully means its more likely to stick around for a turn or two so you can boost Boo and fling him at something and draw some cards
If Faithless Looting for then again for is too broken for a format where you're allowed to have 4 Amulet of Vigor in play at the same time, consider a card like Merfolk Looter