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However, I dont know what format wants to pay four mana for this effect

The most prevalent of these strategies was "Chain Burn" , and the core card of these decks was Chain Strike, which can deal massive damage in one chain

That seems somewhat unlikely (cultivate wouldn't be terrible) so this will be relegated to slower decks that really want to play extra lands (this says "put onto the battlefield" not "play")

Absurdly high HP (250+) usually indicates a Pokemon ex, V, VMAX, or VSTAR card, all of which are above standard rare in rarity

It'll essentially give you two extra draws in your upkeep, and give you either 3/1 tokens or Treasures to take advantage of