This effect even hits basic lands, so it can be quite strong when it comes to slowing down opponents, especially if they're not already playing black
It is more efficient in many ways than most ramp spells and saw some play when it was reprinted in Dragons of Tarkir (2015)
The foretell mechanic makes it especially sneaky: You can exile it early and keep just 3 mana open when you need it most
Coincidentally, I really like the Siclee I got, and I put one in my favorite deck as a main card
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(9/20/2024) In a Two-Headed Giant game, life gained by your teammate won't cause Leyline of Hope's second ability to apply, even though it will cause your team's life total to increase