Geyser Drake

The cost reduction only fires on turns that are not yours, which inverts what most cheap blue creatures are for: this is a body built to punish the opponent's window rather than sharpen your own. Baral, Chief of Compliance and its kin cheapen the spells you cast proactively; this one deliberately does the opposite, discounting everything you hold up while the opponent is acting. It is a permission enabler that never wants to attack: leave it back, keep mana open, and every counterspell, flash creature, or instant-speed removal in hand quietly gets a mana cheaper the moment it is the other player's turn. The 2/3 flying body is incidental, an evasive clock that can eventually chip in once the game stabilizes, but the reduction is the whole reason it exists. The tension in the design is that the discount is worthless to a proactive deck; you have to actually want to do things on your opponent's turn for it to matter at all, which draws a hard line between the decks that see this as a threat and the decks that see it as a wall. That narrowness is what keeps a repeatable cost reduction on a cheap flyer from being oppressive: it rewards the draw-go, hold-up posture that has always defined blue's most patient shells, and it does nothing at all for anyone playing on the front foot.