If enough -1/-1 counters are put on Broodguard Elite at the same time to make its toughness 0 or less, its second ability will see all of the +1/+1 counters it had when it died as well as the -1/-1 counters it had, and an equal number of each of those types of counters (plus any other applicable counters) will be put onto the target creature
Currently seeing standard play as well in Monored Aggro decks, its best home is alongside the Hammer
Appearing extremely rarely in packs of Amonkhet and Hour of Devastation, the Amonkhet Invocations were the final entry in Magic: The Gatherings short-lived Masterpiece series
To play any non-land card, however, you must cast it
This has great potential later in the game and when it costs 7 mana, it will most likely be cast later in the game and that's ok
Once it actually hits the battlefield, attacking with dragons draws you cards and lets you slam free permanents onto the field