Definitely redeeming free codes inside MTGA is the best way to get free cards
On top of this, cards like Sun Titan and Flayer of the Hatebound work perfectly within the graveyard strategies, giving you alternate ways to enact your gameplan without needing Terra
To build a deck, start with a pre-built One Piece starter deck and slowly swap cards you dont like for new ones
Cloud really is perfect for Voltron, however, so thats how well be building him today
ramping is added to the players hand
+2 Karn, Scion of Urza, +2 Vivien Reid, +2 Settle the Wreckage, +2 Knight of Autumn Generally speaking, the board stalls and the real battle is over planeswalkers and Conclave Tribunals