You may pay optional additional costs, such as kicker, and if there are any mandatory additional costs, those must be paid to cast the spell
The lack of haste means Mishra needs to live, but Phyrexian Dragon Engine has Unearth, so you can get that on the field from grave with haste, swing in, and get the meld
Then, select the deck you want to personalize, and when editing that deck, go to More Details, to the right: Notice that sometimes you may miss and to the Sideboard (which is right above More Options), but what youre looking for is the screen shown below: Within a deck's details, you can set individual preferences for companions, sleeves and avatars for when you play that deck
Because Magic templating is consistent, if youre looking for a particular effect on a card, you can start with a card you already know to find the general, searchable template
Basically, you grant the turns Energy to Feebas first, and then in the very next turn, you evolve into Milotic and use its ability and the turns Energy to give it all it needs to attack right away
This one is an interesting card overall, but it wont be played immediately in many decks as it is a bit restrictive