Some color combinations simply dont have any mana ramp worth playing at all, either forcing you to consider extremely mediocre options or exclusively rely on single color cards and mana rocks to get the job done: Dimir (Blue/Black) Boros (Red/White) Orzhov (Black/White) Esper (Black/Blue/White) Grixis (Blue/Black/Red) Abzan (Green/Black/White) Sultai (Black/Green/Blue) Temur (Green/Blue/Red) Most 4-color groupings That doesnt mean all other color combinations have amazing ramp options though many can only offer situationally powerful cards
Assuming youre not going to try proliferate shenanigans, you can also try Tyrite Sanctum, although thatll take a little time
Theres a spells deck to build in Final Fantasy Limited, so Dovin's Veto is still a very solid sideboard card
Legendary Creature - Human Knight Noble Dragonhawk, Fate's Tempest Flying Whenever Dragonhawk enters or attacks, exile the top X cards of your library, where X is the number of creatures you control with power 4 or greater
Anytime you cast a spell you get to put a +1/+1 counter on any creature, give that creature flying for the turn, and make an opponent draw a card