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Two questions about this card:

I read that when you pair  {Wolfir Silverheart} with another creature, only the other creature gets +4/+4 and not Wolfir Silverheart. Is that true or do both cards get the effect.

Can you pair a Wolfir Silverheart with another Wolfir Silverheart? If so, (assuming that they both get the effect) would they both get +4/+4, making them both 12/12 creatures?

I'm gonna piggy back off this post. So I have a friend that had three  {Goblin Electromancer} out and then played  {Epic Experiment}. He payed the red and blue cost and then paid three mana for X. His logic was that since the three goblins were out, that's a free +3 towards X and so he drew six... Is this correct, or should he have only drawn for the mana he paid? I'm pretty new to the game so sorry if this question is redundant in this post but I just want to be sure

Darn... Thanks

 {Rubblebelt Raiders}
What hall a to this card's effect if it has double strike?

For example: Let's say I have this card + two other creatures out. I also have a card that gives them all double strike. If I have all three attack, does Rubblebelt Raiders get +3/+3 on the second strike of double strike. What im finally trying to ask is would that mean that one the first strike of all the creatures, I know it becomes a 6/6. But on the second of the double strike, does it get +3/+3 more, attacking the second time for 9/9?

Thanks!

 {Chromatic Lantern}
Does this mean, for example, if I have 5 lands, this will make it so if I tap them all, I'll have 10 mana at my disposal, plus the cards own tap ability?

Thanks a lot!

Okay so I'm a little confused about this card. For example; if I want to deal three damage to a creature with flying and a creature without flying, am I only paying a green, a red and there more mana to fulfill the X? Or would I have to pay another three to do three damage to both?