Caged Sun (Surge Foil) [Warhammer 40,000] 151 That player may pay 10

That player may pay 10 life

but you might want a card that guarantees you can Summon them when you need them too

Set: Neo Destiny Unlimited Type: Water Rarity: Common Retreat cost: Colorless

and even supporting some classics

Set: Mythic Edition Type: Legendary Planeswalker — Tamiyo Rarity: Mythic Cost: {3}{U}{U} +1: Tap target permanent

Caged Sun (Surge Foil) [Warhammer 40,000] 151 That player may pay 10Set: Warhammer 40,000 Type: Artifact Rarity: Rare Cost: {6} As Caged Sun enters the battlefield, choose a color. Creatures you control of the chosen color get +1 +1. Whenever a land's ability causes you to add one or more mana of the chosen color, add one additional mana of that color.