Basiic TCG MTG rules v.0005 the basics
A card's level is it's converted mana cost. Total up how many colored mana symbols and uncolored mana it would take to cast in MTG. That's the card's level. You do not need to generate specific kind of mana for basic tcg mtg cards. A basic land has a level of 1 but can only be played as your 1 free level 1 card on your turn.
Otherwise the card functions like a normal Basic TCG card.
Damage works as usual for Basic TCG, impacting level.
When deciding if a non MTG card counts as a certain type of card, decide it amongst yourselves filling in the blanks as you go and always be having fun.
Is a duck a creature? Probably. Is an egg? Maybe.
Is an oven also an enchantment? It would be funny if it was so yes?
Generating Mana: If a card generates mana, it instead generates an equivalent number of levels that you can use for playing cards. They do not need to be sacrificed unless that is part of the ability.
Tapping: If something would cause a card to tap, it is an action that uses up that card action. If something would not cause a card to tap, it is a passive that should be considered in effect. If a card has an ability that doesn't cause it to tap but does seem like an action, using the action allows the card do the action several times in a row at once but then that's its action for the turn. If this card can take other actions as well you can use those other actions but if any of them require tapping, then the action is gone.
If an action requires mana, you can also generate mana by sacrificing cards in play or discarding cards. A sacrificed card in play is worth a number of mana equal to its level. A discarded card from your hand is worth one mana. All mana is colorless so don't worry about that.
Example:
Llanowar elves can be tapped to generate one green mana. That means as an action Llanowar elves can let you play a level 1 card or contribute 1 level to a larger card.
Sensei's Divining Top lets you spend mana to look at the top three cards of your deck and put them back in any order. You can do that as many times as you want in a row as an action since this doesn't require tapping. But there isn't much point to it. And you have to spend mana each time you do it.