This is inherently powerful stuff we're dealing with so watch out for all those artifact and bird token generators
The main downside is that blinking a legendary creature isnt going to have the copy hang around that long

[1] Bug Weak against : Fire, Flying, Rock Strong against : Grass, Dark, Psychic Dark Weak against : Bug, Fairy, Fighting Strong against : Ghost, Psychic Dragon Weak against : Dragon, Fairy, Ice Strong against : Dragon Electric Weak against : Ground Strong against : Flying, Water Fairy Weak against : Poison, Steel Strong against : Fighting, Dark, Dragon Fighting Weak against : Fairy, Flying, Psychic Strong against : Dark, Ice, Normal, Rock, Steel Fire Weak against : Ground, Rock, Water Strong against : Bug, Grass, Ice, Steel Flying Weak against : Electric, Ice, Rock Strong against : Bug, Fighting, Grass Ghost Weak against : Dark, Ghost Strong against : Ghost, Psychic Grass Weak against : Bug, Fire, Flying, Ice, Poison Strong against : Ground, Rock, Water Ground Weak against : Grass, Ice, Water Strong against : Electric, Fire, Poison, Rock, Steel Ice Weak against : Fighting, Fire, Rock, Steel Strong against : Dragon, Flying, Grass, Ground Normal Weak against : Fighting Strong against : None Poison Weak against : Ground, Psychic Strong against : Fairy, Grass Psychic Weak against : Bug, Dark, Ghost Strong against : Fighting, Poison Rock Weak against : Fighting, Grass, Ground, Steel, Water Strong against : Bug, Fire, Flying, Ice Steel Weak against : Fighting, Fire, Ground Strong against : Fairy, Ice, Rock Water Weak against : Electric, Grass Strong against : Fire, Ground, Rock Practice is the best way to learn and remember all of the different types strengths and weaknesses

Its only drawback is, once again, the fact that the effect is tied to a creature that needs to tap to activate
(11) Damage counters