While a meld card is in any zone other than the battlefield, it has only the characteristics of its front face
To accurately calculate the duties, you need to know the exact HS code applicable to your acrylic cases
It obviously doesnt do a whole lot outside of that unless youre playing Commander, of course, and want to protect that legendary creature thats likely heading up your deck from the command zone
If one player plays a field spell while there is a FACE-UP Field Spell already active, the first field spell is destroyed and the second one is now active (unless the activation of the field spell was negated)
Some other sites that sell cards that can also be used as a reference are ChannelFireball, Star City Games, and Card Kingdom
These tap-dudes-for-mana cards always play out well, though theyre rarely attached to a body like this