Marine 208/202 has found her way into a number of spicy brews and follows down the same path of Professors Research, in that it is a supporter card that grants card advantage, while at same time allowing for some sweet plays that overall lowers your opponents card count, while at the same time, restocking yours, setting you ahead in the resource race
The same is true for fear, first strike, double strike, deathtouch, haste, landwalk, lifelink, protection, reach, trample, shroud, and vigilance
Not really a staple, but it might enter Standard for certain niche builds, and could even have a place in Historic thopter decks
Notable Omissions Craterhoof Behemoth WotC mentioned Craterhoof Behemoth as a consistent game-ending card for green, but stated that it's at an appropriate power level for an 8-mana card
What a supreme flavor win
For 4 mana you gain life equal to two times the number of dorks on the battlefield