At 4 mana, you could wipe the board of all creatures with toughness 3 or less, destroy three vital artifacts of an artifact-matters deck, or deal a massive 6 damage to each opponent
This is because as the number of players increases, the number of creatures on the battlefield generally increases too
Ambrosia Whiteheart Champion of the Clachan Dust Elemental Flock Impostor Jeskai Barricade Loyal Gryff Mischievous Pup Night Nurse, Healer of Heroes Otherworldly Escort Phelia, Exuberant Shepherd Rescuer Chwinga Restoration Angel Rhys, the Evermore Salvation Swan Samwise the Stouthearted Stonecloaker Sunpearl Kirin Vizier of Deferment Whitemane Lion
This legendary creature costs five mana (one white, one blue, one black, one red, and one green) and demands an immediate response from opponents upon casting
How to Gain Life Gaining life is actually a very easy thing to do in just about every part of the color pie