mtg green card draw enchantment Keen Sense Enchant creature Whenever enchanted creature deals damage to an opponent Mono Green Card Draw Help

There are many, many ways to get rid of cards for either cash or different cards

It costs a hefty 6 mana, but you immediately get a 5/5 menace haste and trample creature and an incredible sacrifice trigger on attacks

Tireless Tracker and Elmar, Ulvenwald Informant can give you the Clue tokens needed for the time lord doctors ability

If you have enough mana and unblocked attackers, you can activate the library ninjutsu abilities of multiple Panglacial Shinobi during a single search effect

2019-01-25 If an effect allows a player to cast a spell without paying its mana cost, that player cant choose to cast it and pay its mana cost unless another rule or effect allows that player to cast it that way