how many cards in booster pack mtg Magic The Gathering Foundations Play – Trading Card Market The expansion symbol was a stylized 7. Booster pack - MTG Wiki

If you win the flip, this creature phases out

On top of that, the core combo here is very easy to disrupt post-sideboard

Instead, look at Narnam Renegade, Gnarlwood Dryad, Wasteland Viper, and Venerated Rotpriest

There isn't any good direct comparison to Mangara's abilities, but the closest thing that popped into my head is Runic Armasaur, another creature whose card drawing ability is entirely dependent on your opponents' actions, making the card inconsistent where it sometimes draws you zero cards and sometimes floods you with card draw

Like the latter, this is card disadvantage

Once played, it allows you to gain health for each other creature summoned while Trostani is on the battlefield