Favorite Spell

You are so familiar with a mastered spell that you can cast it effortlessly and with aplomb. Choose a spell you can cast of 5th level or lower to be your favorite spell. You can take this feat multiple times, choosing a different favorite spell each time. You gain the following benefits. 

• When you cast your favorite spell using a spell slot, you can imbue it with a harmless but impressive visual effect of your choice, such as a shower of sparks or a flurry of illusory doves.
• When you cast your favorite spell using a spell slot, you can treat it as if you cast it using a spell slot of one level higher up to a maximum of 9th level.
• Your favorite spell cannot be counterspelled.
• You can cast your favorite spell once at its lowest level without using a spell slot. Once you use this ability you cant do this again until you finish a long rest.