A 1/1 Servo for two mana is fine, and being able to replace it with a 1/1 flying Thopter for one more mana is also just okay
Not only does it add a +1/+1 counter to your creatures that deal combat damage to a player, synergizing nicely with Tidus, but it also gives all creatures you control with counters trample and reach, which are powerful abilities
Its still a nice value booster for the drop, though, and a well-known card that can do work in Commander if you dont play Vintage
The 1st Edition Charizard is one of the most sought after cards of all time, and its value continues to increase as the years go by
(Sacrifice, discard, draw)
Its exactly the same effect as blink, (named for the Time Spiral card Momentary Blink (although Momentary Blink only targeted Creatures, while Flicker hit nontoken permanents