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Act of Treason will wear off even if you activate Obeka to end your turn, because you're literally ending your turn, and there's not return trigger attached to Act of Treason

Meanwhile, Injury is a strictly worse version of a very old common named Lunge, which has the exact same effect as Injury but at instant speed

Choose target creature with mana value less than X

(2004-10-04) You can't use the Library of Leng ability to place a discarded card on top of your library when you discard a card as a cost, because costs aren't effects

Mana ramp involves finding ways to get more of your lands onto the battlefield as quickly as possible and/or creating reusable sources of mana through permanents on the battlefield