Braingeyser

Target player draws X cards.

Target player draws 2ˣ cards. (2º = 1, 2¹ = 2, 2² = 4, 2³ = 8, 2⁴ = 16, 2⁵ = 32, and so on.)

Target player draws three cards.

Each player draws X cards.

Target player draws two cards, then discards four cards.

Target player mills two cards. Draw two cards.