According to the Baldurs Gate 3 wiki, Shadowheart is a Half-Elf and a Trickery Domain Cleric, which gives your party heals, buffs and interesting stealth and deception spells. The card plays a similar role in Magic, but at the expense of your other creatures
Still, as long as you have some life to spare, you can crank up the number of flips each turn, sometimes taking some damage, sometimes getting a nice card draw payout
If you and your group of friends are looking for a set of EDH precons that you can purchase, sleeve up, and play with, this product isnt for you
But to that point, it should never have been published nor placed in the Gatherer
Emerald/Ruby is a control-style deck that has some strong advantages in multiplayer and does a great job stalling the Steel/Sapphire starter deck in particular