Black-Red: Void The void mechanic, a thematic twist on revolt or morbid, is found only in red-black
The reason the designers did it this was that they wanted to be able to spread out the +1/+1 bonuses how the player saw fit which included putting multiples on the same creature and at the time the rules didn't allow it
After the Pikachu float appeared during the Macys Thanksgiving Day Parade, the people there showed the Pokemon 25th anniversary logo
Swords to Plowshares is not what you might consider as a life gain card but a good number of games have been saved and then won with the Plowing of your own guy for life, not ideal situations but better than death and all from a card you were playing purely as a removal spell
Since card advantage and attrition are vital components of winning control decks and strategies, board wipes, or spells that remove all of a certain type of permanent from the battlefield (usually creatures) are great ways to break parity, remove a lot of opposing resources, and address a lot of potential threats at once