This is the type of card that might look like its not doing anything because its not triggering, but it might not be triggering because its actively disincentivizing opponents from doing something else
Im hoping the BR and the UW lands especially get cheap, but alongside the Surveil lands, these represent an easy way to have two of two colors open on turn two, which is not true in lots of formats
River Song Nonlinear time This three-mana blue and red 2/2 is River Song, who is a human time-lord rogue - quite the mix of creature types
EXPEDITED UNDERTAKINGS The oldest and arguably best way to maximize your advantage from discarding cards is to make sure you discard something expensive and nasty, then abuse a cheap card like Reanimate to put it directly onto the battlefield much faster than is really fair
Legality depends on the tournament format -- Urza, Lord High Artificer can be legal in some formats and banned or restricted in others