Mystery Booster cards are virtually the same as other cards, with the exception of the small planeswalker symbol in the bottom-right of the card
Dyadrine, Synthesis Amalgam Dyadrine, Synthesis Amalgam works like a hydra except that it lets you eat away at it or other creatures in order to make creatures and draw cards
This can actually have some pretty interesting gameplay applications, particularly in green where you might have the biggest creatures and this will clear out small utility creatures or other weaklings that might get in their way
But you can also snipe a small nonland permanent, and youve paid 2 mana for this, so its an equal exchange
Set boosters include fewer cards than draft or collector's boosters, only having 14 instead of the usual 16
In practice, many of the Tyranids play similar to the hydras that use X mana costs