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There are infinite combos that outright win you the game, like with Walking Ballista, but Heliod can be a centerpiece of devotion decks, +1/+1 counters, lifegain decks, and enchantment-based decks

Its used in some red prison decks that use planeswalker cards like Chandra, Torch of Defiance that generates mana to rebuild faster or fast mana sources like Chrome Mox

This type of game is really hard to design. There would be others

Thats going to lead to some pretty significant price drops as these cards hit the market

The most likely place for this combo (in fact the only place where a 10 mana combo is viable) is Commander games, where the combo could help you dig for a key card in your deck, whatever win condition or answer you need