Wyluli Wolf

: Target creature gets +1/+1 until end of turn.

Old Man of the Sea

You may choose not to untap Old Man of the Sea during your untap step.
: Gain control of target creature with power less than or equal to Old Man of the Sea’s power for as long as Old Man of the Sea remains tapped and that creature’s power remains less than or equal to Old Man of the Sea’s power.

Mijae Djinn

Whenever Mijae Djinn attacks, flip a coin. If you lose the flip, remove Mijae Djinn from combat and tap it.

Magnetic Mountain

Blue creatures don’t untap during their controllers’ untap steps.
At the beginning of each player’s upkeep, that player may choose any number of tapped blue creatures they control and pay for each creature chosen this way. If the player does, untap those creatures.