While many cards in a standard 78 card tarot deck, are symbolic of strength and courage, there are some cards that can be considered to be typically strong. In a Rider-Waite deck, some of them are-
Six Of Swords
The card depicts a figure rowing a boat with two passengers out of the choppy waters into a calmer zone. The card is symbolic of escaping difficulties and looking beyond the current pain by moving to a better space. It urges you to be strong enough to leave the painful past behind.
Seven Of Wands
This card shows a figure fighting all alone and when associated with number 7 in the Major Arcana; The Chariot; it indicates a victory. But to achieve that victory, to pursue your dream, you need strength to ward off the opposition. It’s only the strong who will be willing to face the unforeseen hurdles in the path ahead.
Eight Of Cups
The card shows a man leaving behind (Not deserting) his current situation and going into a cave. It takes great strength to emotionally withdraw from a current course, in order to seek the next best step for yourself as the need of the hour is to tend for yourself. It is a card of sacrifice and any kind of sacrifice needs strength.
Nine Of Wands
The card shows a wounded man who seems to be willing to continue fighting all alone against all odds. He is not ready to give up yet. The card is a symbol of strength and this is the time for you to exercise tremendous physical and mental discipline. Be ready to face a challenge and face the future unafraid.