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
Bloodthirsty Conqueror, indeed
How to Gain Life Gaining life is actually a very easy thing to do in just about every part of the color pie
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
Both are fundamental in almost every aggressive deck that can use them and have a constant presence in various metagames in their respective games
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