In a Tribal deck, it's basically a better combination of Coastal Piracy and one half Dire Undercurrents, drawing you tons of cards just for putting creatures into play and turning them sideways
The downside is that its got several printings and even multiple foils to choose from
Convoke I love a free spell however I also love balance and fair cards and these two things are rather at odds
(They can't be blocked except by artifact creatures and/or black creatures.) Sorcery Shriekmaw Fear (This creature can't be blocked except by artifact creatures and/or black creatures.) When this creature enters, destroy target nonartifact, nonblack creature
Specifically, you get to conjure the Power Nine, which are: Ancestral Recall Black Lotus Mox Emerald Mox Jet Mox Pearl Mox Ruby Mox Sapphire Timetwister Time Walk Even better, you can blink Oracle of the Alpha a few times to get even more copies of cards like Time Walk in your deck to start taking as many turns as you need