Thraben InspectorutilityBudget$0.12Not a life-gain card, but it fills a similar white creature slot by replacing itself with immediate value on entry. It is a cheaper budget-friendly ETB utility creature.
Baneslayer Angelfinisher$6.11A powerful white creature that stabilizes the board and often swings life totals decisively. It is a strict upgrade in combat impact while serving a similar defensive life-buffer role.
Aerial ResponderutilityBudget$0.25This is another white creature that helps stabilize through lifelink, similar to entering the battlefield and gaining life. It is cheaper and more aggressive than Spiritual Guardian.
Soul Wardenutility$2.76A classic white life-gain creature that repeatedly gains life from creatures entering the battlefield. It is much cheaper but occupies the same life-buffer role.
Venerable MonkutilityBudget$0.09An efficient white creature that gains life on entry and provides immediate stabilization. It is a smaller, cheaper analogue to Spiritual Guardian's ETB life-gain effect.
Kor CelebrantutilityBudget$0.15This creature gains life when it enters and can also support go-wide or party-style strategies. It is a lower-cost functional alternative for immediate life gain.
Serra AngelfinisherBudget$0.11A classic white midrange flyer that functions as a defensive stabilizer, though without direct life gain. It occupies a similar slot as a sturdy five-mana white creature.
Sunscorch RegentfinisherBudget$0.30A white dragon that repeatedly gains life as opponents cast spells, providing a durable life-swinging threat. It costs slightly more, but offers much stronger ongoing lifegain value.