All Level 4 or lower Monsters are Special Summoned in Attack or Face-Down Defense Position, with the rest of the cards being added to each player's Hand
Also I think there is low chance to trigger it more than 2 times per turn even without restriction
The only way that isn't the case is if they're running a similar deck, and oftentimes you won't know in advance whether that's the case
Short of exile or sacrifice abilities, hes not going anywhere once he lands
Even with the 50% more effect than Sleight you will find that Adventurous Impulse is less good sooner than the maths would suggest (ie when your deck is a third non-creature, non-land cards)
On that theme, Sheoldred, Whispering One, Dread Return, and Ancient Greenwarden are also fantastic with the graveyard as a resource and dominate late game plays