My Verdict: Colossus Hammer may be a one-trick pony, but its a very good trick that can catch a lot of foes off-guard
The only downside is that you need to discard two Psychic Energy when using this Move
However, they are also included in Japans Tag Team GX All Stars set, making them highly collectible among Japanese-exclusive releases
Do note the oracle text, though, as it only works until the end of the turn, not forever, so you can prevent the next damage dealt by a red or black source
A Poor Strip Mine (V.2) might be worth only 17, but a Near Mint Strip Mine (V.2) goes for at least 100
(It enters with a +1/+1 counter on it for each color of mana spent to cast it.) At the beginning of your end step, if there are thirty or more counters among artifacts and creatures you control, this artifact deals 10 damage to each opponent