In the case of Ritual Summoning, rather than the targeted monster being in your Extra Deck, you will need the Ritual Monster (always printed in a light blue card design) in your hand to be able to summon it
There are a number of great ways to make your instants and sorceries cost less (Curious Homunculus being one of them), but the best of these cards in blue is probably Wizards of Thay
Nesting Dovehawk can be found off of Recruiter and, if you choose to Offspring it, can quickly call in the rest of the cote
This beautifully illustrated card by Cona Nitanda portrays the peaceful setting of an afternoon nap, as long as one doesn't think too deeply about what Musharna might be doing
Anything meaningfully outside that window is suspect
Next you would cast Reanimate, search your graveyard for that creature and put it directly onto the battlefield