Diminishing Returns [Classic Sixth Edition] Future the player can activate mana

the player can activate mana abilities only if they're from lands that player controls and only if mana they produce is spent to activate other mana abilities of lands the player controls and/or to play that card

If that player doesn't

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Set: Kaladesh Inventions Type: Artifact — Equipment Mythic Cost: {3} Equipped creature gets +2/+2 and has protection from red and from white

Set: Unlimited Edition Type: Enchantment Rare Cost: {3}{R} Whenever a player taps a land for mana

Diminishing Returns [Classic Sixth Edition] Future the player can activate manaSet: Classic Sixth Edition Type: Sorcery Rare Cost: {2}{U}{U} Each player shuffles their hand and graveyard into their library. You exile the top ten cards of your library. Then each player draws up to seven cards.